Remove redundant DevToolsManager methods and clean up its clients.

content/browser/devtools/devtools_external_agent_proxy_impl.h

 // Copyright (c) 2013 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_DEVTOOLS_DEVTOOLS_EXTERNAL_AGENT_PROXY_IMPL_H
 #define CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_EXTERNAL_AGENT_PROXY_IMPL_H
 
 #include "base/memory/ref_counted.h"
 #include "content/public/browser/devtools_external_agent_proxy.h"
 
 namespace content {
 
 class DevToolsExternalAgentProxyImpl
     : public DevToolsExternalAgentProxy {
  public:
   explicit DevToolsExternalAgentProxyImpl(
       DevToolsExternalAgentProxyDelegate* delegate);
   virtual ~DevToolsExternalAgentProxyImpl();
 
   // DevToolsExternalAgentProxy implementation.
   virtual scoped_refptr<DevToolsAgentHost> GetAgentHost() OVERRIDE;
+  virtual void DispatchOnClientHost(const std::string& message) OVERRIDE;
   virtual void ConnectionClosed() OVERRIDE;
 
  private:
   class ForwardingAgentHost;
 
   scoped_refptr<ForwardingAgentHost> agent_host_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsExternalAgentProxyImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_EXTERNAL_AGENT_PROXY_IMPL_H