Remove redundant DevToolsManager methods and clean up its clients.

content/browser/devtools/devtools_manager_impl.h

Index: content/browser/devtools/devtools_manager_impl.h
diff --git a/content/browser/devtools/devtools_manager_impl.h b/content/browser/devtools/devtools_manager_impl.h
index 6e1607c33f783f39a8eb282f077f3d6b3201436c..a5f4245f3177b0948015080139ee0b0c8df0b014 100644
--- a/content/browser/devtools/devtools_manager_impl.h
+++ b/content/browser/devtools/devtools_manager_impl.h
@@ -49,15 +49,12 @@ class CONTENT_EXPORT DevToolsManagerImpl
   virtual bool DispatchOnInspectorBackend(DevToolsClientHost* from,
                                           const std::string& message) OVERRIDE;
   virtual void CloseAllClientHosts() OVERRIDE;
-  virtual DevToolsClientHost* GetDevToolsClientHostFor(
-      DevToolsAgentHost* agent_host) OVERRIDE;
+  virtual bool IsAttached(DevToolsAgentHost* agent_host) OVERRIDE;
   virtual DevToolsAgentHost* GetDevToolsAgentHostFor(
       DevToolsClientHost* client_host) OVERRIDE;
   virtual void RegisterDevToolsClientHostFor(
       DevToolsAgentHost* agent_host,
       DevToolsClientHost* client_host) OVERRIDE;
-  virtual void UnregisterDevToolsClientHostFor(
-      DevToolsAgentHost* agent_host) OVERRIDE;
   virtual void ClientHostClosing(DevToolsClientHost* host) OVERRIDE;
 
  private:
@@ -71,6 +68,11 @@ class CONTENT_EXPORT DevToolsManagerImpl
   void UnbindClientHost(DevToolsAgentHostImpl* agent_host,
                         DevToolsClientHost* client_host);
 
+  DevToolsClientHost* GetDevToolsClientHostFor(
+      DevToolsAgentHostImpl* agent_host);
+
+  void UnregisterDevToolsClientHostFor(DevToolsAgentHostImpl* agent_host);
+
   // These two maps are for tracking dependencies between inspected contents and
   // their DevToolsClientHosts. They are useful for routing devtools messages
   // and allow us to have at most one devtools client host per contents.