Remove unused test utils (dart-lang/watcher#101)

pkgs/watcher/test/utils.dart

diff --git a/pkgs/watcher/test/utils.dart b/pkgs/watcher/test/utils.dart
index 9b4fd28..aa23d50 100644
--- a/pkgs/watcher/test/utils.dart
+++ b/pkgs/watcher/test/utils.dart
@@ -175,14 +175,6 @@
 Future expectRemoveEvent(String path) =>
     _expectOrCollect(isWatchEvent(ChangeType.REMOVE, path));
 
-/// Consumes an add event for [path] if one is emitted at this point in the
-/// schedule, but doesn't throw an error if it isn't.
-///
-/// If this is used at the end of a test, [startClosingEventStream] should be
-/// called before it.
-Future allowAddEvent(String path) =>
-    _expectOrCollect(mayEmit(isWatchEvent(ChangeType.ADD, path)));
-
 /// Consumes a modification event for [path] if one is emitted at this point in
 /// the schedule, but doesn't throw an error if it isn't.
 ///
@@ -191,14 +183,6 @@
 Future allowModifyEvent(String path) =>
     _expectOrCollect(mayEmit(isWatchEvent(ChangeType.MODIFY, path)));
 
-/// Consumes a removal event for [path] if one is emitted at this point in the
-/// schedule, but doesn't throw an error if it isn't.
-///
-/// If this is used at the end of a test, [startClosingEventStream] should be
-/// called before it.
-Future allowRemoveEvent(String path) =>
-    _expectOrCollect(mayEmit(isWatchEvent(ChangeType.REMOVE, path)));
-
 /// Schedules writing a file in the sandbox at [path] with [contents].
 ///
 /// If [contents] is omitted, creates an empty file. If [updateModified] is