Normalize packages' library names.

This makes the library names play nicer with dartdoc.

Review URL: https://codereview.chromium.org//13674024

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/stack_trace@21106 260f80e4-7a28-3924-810f-c04153c831b5

pkgs/stack_trace/lib/stack_trace.dart

diff --git a/pkgs/stack_trace/lib/stack_trace.dart b/pkgs/stack_trace/lib/stack_trace.dart
index 455dd57..5747b85 100644
--- a/pkgs/stack_trace/lib/stack_trace.dart
+++ b/pkgs/stack_trace/lib/stack_trace.dart
@@ -4,8 +4,5 @@
 
 library stack_trace;
 
-import 'src/trace.dart';
-import 'src/frame.dart';
-
 export 'src/trace.dart';
 export 'src/frame.dart';