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

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

 // 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.
 
 library dart2js.cmdline;
 
 import 'dart:async';
 import 'dart:collection' show Queue, LinkedHashMap;
 import 'dart:io';
 import 'dart:utf';
@@ skipping 205 matching lines @@
           break;
         default:
           throw 'Internal error: "$shortOption" did not match';
       }
     }
   }
 
   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',
                       (_) => diagnosticHandler.showHints = false),
     new OptionHandler('--output-type=dart|--output-type=js', setOutputType),
     new OptionHandler('--verbose', setVerbose),
     new OptionHandler('--version', (_) => wantVersion = true),
     new OptionHandler('--library-root=.+', setLibraryRoot),
     new OptionHandler('--out=.+|-o.*', setOutput, multipleArguments: true),
     new OptionHandler('--allow-mock-compilation', passThrough),
@@ skipping 145 matching lines @@
   void add(String value) {
     sink.add(value);
     count += value.length;
   }
 
   void addError(Object error) { sink.addError(error); }
 
   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}.');
   }
   var file = new File(uriPathToNative(uri.path)).openSync(mode: FileMode.WRITE);
   file.writeStringSync(text);
   file.closeSync();
 }
 
 void fail(String message) {
@@ skipping 164 matching lines @@
       print(trace);
     } finally {
       exit(253); // 253 is recognized as a crash by our test scripts.
     }
   }
 }
 
 void main() {
   mainWithErrorHandler(new Options());
 }