Fix for an issue w/ breakpointResolved events not being sent.

tests/standalone/debugger/tostring_throws_test.dart

Index: tests/standalone/debugger/tostring_throws_test.dart
===================================================================
--- tests/standalone/debugger/tostring_throws_test.dart	(revision 0)
+++ tests/standalone/debugger/tostring_throws_test.dart	(revision 0)
@@ -0,0 +1,28 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// 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.
+
+import "debug_lib.dart";
+
+main() {
+  if (RunScript(testScript)) return;
+  
+  Foo foo = new Foo();
+  
+  print("Hello from debuggee");
+}
+
+class Foo {
+  String toString() {
+    throw 'I always throw';
+  }
+}
+
+var testScript = [
+  MatchFrame(0, "main"),
+  SetBreakpoint(12),
+  Resume(),
+  MatchFrame(0, "main"),
+  MatchLocals({"foo": "#ERROR"}),
+  Resume(),
+];