Don't request bug reports when aborting due to --throw-on-error.

dart/sdk/lib/_internal/compiler/implementation/dart2js.dart

Index: dart/sdk/lib/_internal/compiler/implementation/dart2js.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/dart2js.dart b/dart/sdk/lib/_internal/compiler/implementation/dart2js.dart
index 635f8f0a45cb732ece397b03a4a12e47ce052899..a36c516012f24ba1647c1345a42068b9796ea1a1 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/dart2js.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/dart2js.dart
@@ -223,8 +223,7 @@ void compile(List<String> argv) {
   List<String> arguments = <String>[];
   List<OptionHandler> handlers = <OptionHandler>[
     new OptionHandler('-[chv?]+', handleShortOptions),
-    new OptionHandler('--throw-on-error',
-                      (_) => diagnosticHandler.throwOnError = true),
+    new OptionHandler('--throw-on-error', passThrough),
     new OptionHandler('--suppress-warnings',
                       (_) => diagnosticHandler.showWarnings = false),
     new OptionHandler('--suppress-hints',
@@ -390,12 +389,6 @@ class CountingSink implements EventSink<String> {
   void close() { sink.close(); }
 }
 
-class AbortLeg {
-  final message;
-  AbortLeg(this.message);
-  toString() => 'Aborted due to --throw-on-error: $message';
-}
-
 void writeString(Uri uri, String text) {
   if (uri.scheme != 'file') {
     fail('Error: Unhandled scheme ${uri.scheme}.');