Rework error handling in the service protocol and in Observatory.

runtime/observatory/lib/src/elements/service_view.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 service_object_view_element;
 
 import 'dart:html';
 import 'package:logging/logging.dart';
 import 'package:observatory/service.dart';
 import 'package:observatory/tracer.dart';
@@ skipping 108 matching lines @@
       case 'RandomAccessFileList':
         IORandomAccessFileListViewElement element =
             new Element.tag('io-random-access-file-list-view');
         element.list = object;
         return element;
       case 'RandomAccessFile':
         IORandomAccessFileViewElement element =
             new Element.tag('io-random-access-file-view');
         element.file = object;
         return element;
-      case 'ServiceError':
-        ServiceErrorViewElement element =
-            new Element.tag('service-error-view');
-        element.error = object;
-        return element;
-      case 'ServiceException':
-        ServiceExceptionViewElement element =
-                    new Element.tag('service-exception-view');
-        element.exception = object;
-        return element;
       case 'Script':
         ScriptViewElement element = new Element.tag('script-view');
         element.script = object;
         return element;
       case 'VM':
         VMViewElement element = new Element.tag('vm-view');
         element.vm = object;
         return element;
       default:
         if (object.isInstance ||
@@ skipping 72 matching lines @@
 
   dynamic expander() {
     return expandEvent;
   }
 
   void expandEvent(bool exp, var done) {
     expand = exp;
     done();
   }
 }