Fix a bug where the JavaBridgeDispatcherHost is prematurely deleted

content/browser/renderer_host/java/java_bridge_dispatcher_host.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_JAVA_JAVA_BRIDGE_DISPATCHER_HOST_H_
 #define CONTENT_BROWSER_RENDERER_HOST_JAVA_JAVA_BRIDGE_DISPATCHER_HOST_H_
 #pragma once
 
 #include "base/memory/ref_counted.h"
 #include "base/string16.h"
@@ skipping 21 matching lines @@
   // object is next cleared, this proxy object is bound to the window object
   // using |name|. The proxy object remains bound until the next time the
   // window object is cleared after a call to RemoveNamedObject() or
   // AddNamedObject() with the same name. The proxy object proxies calls back
   // to |object|, which is manipulated on the background thread. This class
   // holds a reference to |object| for the time that the proxy object is bound
   // to the window object.
   void AddNamedObject(const string16& name, NPObject* object);
   void RemoveNamedObject(const string16& name);
 
-  // RenderViewHostObserver override:
+  // RenderViewHostObserver overrides:
   // The IPC macros require this to be public.
   virtual bool Send(IPC::Message* msg) OVERRIDE;
+  virtual void RenderViewHostDestroyed() OVERRIDE;
 
  private:
   friend class base::RefCountedThreadSafe<JavaBridgeDispatcherHost>;
   ~JavaBridgeDispatcherHost();
 
   // RenderViewHostObserver override:
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // Message handlers
   void OnGetChannelHandle(IPC::Message* reply_msg);
 
   void GetChannelHandle(IPC::Message* reply_msg);
   void CreateNPVariantParam(NPObject* object, NPVariant_Param* param);
   void CreateObjectStub(NPObject* object, int route_id);
 
   scoped_refptr<NPChannelBase> channel_;
   bool is_renderer_initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(JavaBridgeDispatcherHost);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_JAVA_JAVA_BRIDGE_DISPATCHER_HOST_H_