Get rid of all the library tags.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1580083003 .
diff --git a/pkgs/stack_trace/lib/src/chain.dart b/pkgs/stack_trace/lib/src/chain.dart
index 3f35c16..c282387 100644
--- a/pkgs/stack_trace/lib/src/chain.dart
+++ b/pkgs/stack_trace/lib/src/chain.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library stack_trace.chain;
-
 import 'dart:async';
 import 'dart:collection';
 import 'dart:math' as math;
diff --git a/pkgs/stack_trace/lib/src/frame.dart b/pkgs/stack_trace/lib/src/frame.dart
index 4077c7c..efb2216 100644
--- a/pkgs/stack_trace/lib/src/frame.dart
+++ b/pkgs/stack_trace/lib/src/frame.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library frame;
-
 import 'package:path/path.dart' as path;
 
 import 'trace.dart';
diff --git a/pkgs/stack_trace/lib/src/lazy_trace.dart b/pkgs/stack_trace/lib/src/lazy_trace.dart
index 6bfe51c..618f007 100644
--- a/pkgs/stack_trace/lib/src/lazy_trace.dart
+++ b/pkgs/stack_trace/lib/src/lazy_trace.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library lazy_trace;
-
 import 'frame.dart';
 import 'trace.dart';
 
diff --git a/pkgs/stack_trace/lib/src/stack_zone_specification.dart b/pkgs/stack_trace/lib/src/stack_zone_specification.dart
index 6de43fa..3a9bf48 100644
--- a/pkgs/stack_trace/lib/src/stack_zone_specification.dart
+++ b/pkgs/stack_trace/lib/src/stack_zone_specification.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library stack_trace.stack_zone_specification;
-
 import 'dart:async';
 
 import 'trace.dart';
diff --git a/pkgs/stack_trace/lib/src/trace.dart b/pkgs/stack_trace/lib/src/trace.dart
index 7f2c662..6d9823b 100644
--- a/pkgs/stack_trace/lib/src/trace.dart
+++ b/pkgs/stack_trace/lib/src/trace.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library trace;
-
 import 'dart:collection';
 import 'dart:math' as math;
 
diff --git a/pkgs/stack_trace/lib/src/unparsed_frame.dart b/pkgs/stack_trace/lib/src/unparsed_frame.dart
index f037c8a..7ba9a63 100644
--- a/pkgs/stack_trace/lib/src/unparsed_frame.dart
+++ b/pkgs/stack_trace/lib/src/unparsed_frame.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library stack_trace.unparsed_frame;
-
 import 'frame.dart';
 
 /// A frame that failed to parse.
diff --git a/pkgs/stack_trace/lib/src/utils.dart b/pkgs/stack_trace/lib/src/utils.dart
index 1d09443..5781d5f 100644
--- a/pkgs/stack_trace/lib/src/utils.dart
+++ b/pkgs/stack_trace/lib/src/utils.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library stack_trace.src.utils;
-
 /// The line used in the string representation of stack chains to represent
 /// the gap between traces.
 const chainGap = '===== asynchronous gap ===========================\n';
diff --git a/pkgs/stack_trace/lib/src/vm_trace.dart b/pkgs/stack_trace/lib/src/vm_trace.dart
index 7991160..84fcb10 100644
--- a/pkgs/stack_trace/lib/src/vm_trace.dart
+++ b/pkgs/stack_trace/lib/src/vm_trace.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library vm_trace;
-
 import 'frame.dart';
 import 'utils.dart';
 
diff --git a/pkgs/stack_trace/lib/stack_trace.dart b/pkgs/stack_trace/lib/stack_trace.dart
index 6bba635..1e6f0b0 100644
--- a/pkgs/stack_trace/lib/stack_trace.dart
+++ b/pkgs/stack_trace/lib/stack_trace.dart
@@ -21,8 +21,6 @@
  * [pub]: http://pub.dartlang.org
  * [pkg]: http://pub.dartlang.org/packages/stack_trace
  */
-library stack_trace;
-
 export 'src/chain.dart';
 export 'src/frame.dart';
 export 'src/trace.dart';
diff --git a/pkgs/stack_trace/test/chain/utils.dart b/pkgs/stack_trace/test/chain/utils.dart
index 1e19eeb..366502c 100644
--- a/pkgs/stack_trace/test/chain/utils.dart
+++ b/pkgs/stack_trace/test/chain/utils.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library stack_trace.test.chain.utils;
-
 import 'dart:async';
 
 import 'package:stack_trace/stack_trace.dart';
diff --git a/pkgs/stack_trace/test/frame_test.dart b/pkgs/stack_trace/test/frame_test.dart
index 63035e0..43bce9c 100644
--- a/pkgs/stack_trace/test/frame_test.dart
+++ b/pkgs/stack_trace/test/frame_test.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library frame_test;
-
 import 'package:path/path.dart' as path;
 import 'package:stack_trace/stack_trace.dart';
 import 'package:test/test.dart';
diff --git a/pkgs/stack_trace/test/trace_test.dart b/pkgs/stack_trace/test/trace_test.dart
index d12bc71..edb29fd 100644
--- a/pkgs/stack_trace/test/trace_test.dart
+++ b/pkgs/stack_trace/test/trace_test.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library trace_test;
-
 import 'package:path/path.dart' as path;
 import 'package:stack_trace/stack_trace.dart';
 import 'package:test/test.dart';
diff --git a/pkgs/stack_trace/test/utils.dart b/pkgs/stack_trace/test/utils.dart
index 912f8f4..afa384c 100644
--- a/pkgs/stack_trace/test/utils.dart
+++ b/pkgs/stack_trace/test/utils.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library stack_trace.test.utils;
-
 import 'package:test/test.dart';
 
 /// Returns a matcher that runs [matcher] against a [Frame]'s `member` field.