Fix a bug where the inspector would not keep event pages alive.

content/browser/debugger/devtools_manager_impl.h

 // Copyright (c) 2012 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_IMPL_H_
 #define CONTENT_BROWSER_DEBUGGER_DEVTOOLS_MANAGER_IMPL_H_
 
 #include <map>
 #include <string>
 
@@ skipping 57 matching lines @@
   virtual DevToolsClientHost* GetDevToolsClientHostFor(
       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 int DetachClientHost(DevToolsAgentHost* from_agent) OVERRIDE;
+  virtual void ClientHostOpening(DevToolsClientHost* host) OVERRIDE;
   virtual void ClientHostClosing(DevToolsClientHost* host) OVERRIDE;
   virtual void InspectElement(DevToolsAgentHost* agent_host,
                               int x, int y) OVERRIDE;
   virtual void AddMessageToConsole(DevToolsAgentHost* agent_host,
                                    ConsoleMessageLevel level,
                                    const std::string& message) OVERRIDE;
 
  private:
   friend struct DefaultSingletonTraits<DevToolsManagerImpl>;
 
@@ skipping 34 matching lines @@
       OrphanClientHosts;
   OrphanClientHosts orphan_client_hosts_;
   int last_orphan_cookie_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsManagerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEBUGGER_DEVTOOLS_MANAGER_IMPL_H_