Fix many warnings/errors when building Observatory

runtime/observatory/lib/src/elements/debugger.dart

 // Copyright (c) 2014, 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 debugger_page_element;
 
 import 'dart:async';
 import 'dart:svg';
 import 'dart:html';
 import 'dart:math';
@@ skipping 434 matching lines @@
       int count = 1;
       if (args.length > 0) {
         debugger.console.print('reload expects no arguments');
         return;
       }
       await debugger.isolate.reloadSources();
       debugger.console.print('reload complete');
       await debugger.refreshStack();
     } on S.ServerRpcException catch (e) {
       if (e.code == S.ServerRpcException.kIsolateReloadBarred ||
-          e.code == S.ServerRpcException.kIsolateReloadFailed ||
           e.code == S.ServerRpcException.kIsolateIsReloading) {
         debugger.console.printRed(e.data['details']);
       } else {
         rethrow;
       }
     }
   }
 
   String helpShort = 'Reload the sources for the current isolate';
 
@@ skipping 2855 matching lines @@
   ..setAttribute('height', '24')
   ..children = [
     new PathElement()
       ..setAttribute(
           'd',
           'M11 17h2v-6h-2v6zm1-15C6.48 2 2 6.48 2 12s4.48 10 '
           '10 10 10-4.48 10-10S17.52 2 12 2zm0 18c-4.41 '
           '0-8-3.59-8-8s3.59-8 8-8 8 3.59 8 8-3.59 8-8 8zM11 '
           '9h2V7h-2v2z')
   ];