Make DevToolsManager a singleton, remove it from ContentBrowserClient

content/browser/debugger/devtools_manager.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_DEBUGGER_DEVTOOLS_MANAGER_H_
 #define CONTENT_BROWSER_DEBUGGER_DEVTOOLS_MANAGER_H_
 #pragma once
 
 #include <map>
 #include <string>
 
 #include "base/compiler_specific.h"
+#include "base/memory/singleton.h"
 #include "content/browser/debugger/devtools_agent_host.h"
 #include "content/browser/debugger/devtools_client_host.h"
 #include "content/common/content_export.h"
 
 class DevToolsAgentHost;
 class GURL;
 class RenderViewHost;
 class TabContents;
 
 namespace IPC {
@@ skipping 58 matching lines @@
 
   void AttachClientHost(int client_host_cookie,
                         DevToolsAgentHost* to_agent);
   DevToolsClientHost* GetDevToolsClientHostFor(DevToolsAgentHost* agent_host);
   void RegisterDevToolsClientHostFor(DevToolsAgentHost* agent_host,
                                      DevToolsClientHost* client_host);
   void UnregisterDevToolsClientHostFor(DevToolsAgentHost* agent_host);
   int DetachClientHost(DevToolsAgentHost* from_agent);
 
  private:
+  friend struct DefaultSingletonTraits<DevToolsManager>;
+
   // DevToolsClientHost::CloseListener override.
   // This method will remove all references from the manager to the
   // DevToolsClientHost and unregister all listeners related to the
   // DevToolsClientHost.
   virtual void ClientHostClosing(DevToolsClientHost* host) OVERRIDE;
 
   // DevToolsAgentHost::CloseListener implementation.
   virtual void AgentHostClosing(DevToolsAgentHost* host) OVERRIDE;
 
   // Returns DevToolsAgentHost inspected by the DevToolsClientHost.
@@ skipping 23 matching lines @@
 
   typedef std::map<int, std::pair<DevToolsClientHost*, std::string> >
       OrphanClientHosts;
   OrphanClientHosts orphan_client_hosts_;
   int last_orphan_cookie_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsManager);
 };
 
 #endif  // CONTENT_BROWSER_DEBUGGER_DEVTOOLS_MANAGER_H_