Fix some Observatory issues that crept in with my last couple changes.

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:html';
 import 'observatory_element.dart';
+import 'package:observatory/app.dart';
 import 'package:observatory/cli.dart';
 import 'package:observatory/debugger.dart';
 import 'package:observatory/service.dart';
 import 'package:polymer/polymer.dart';
 
 // TODO(turnidge): Move Debugger, DebuggerCommand to debugger library.
 abstract class DebuggerCommand extends Command {
   ObservatoryDebugger debugger;
 
   DebuggerCommand(this.debugger, name, children)
@@ skipping 1474 matching lines @@
           default:
             busy = false;
             break;
         }
       });
   }
 
   DebuggerInputElement.created() : super.created();
 }