Implement the frame id required for the web navigation api.

chrome/browser/extensions/extension_webnavigation_api.h

 // Copyright (c) 2010 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.
 
 // Defines the Chrome Extensions WebNavigation API functions for observing and
 // intercepting navigation events, as specified in
 // chrome/common/extensions/api/extension_api.json.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBNAVIGATION_API_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBNAVIGATION_API_H_
 #pragma once
 
+#include <map>
+
 #include "base/singleton.h"
 #include "chrome/browser/extensions/extension_function.h"
 #include "chrome/common/notification_observer.h"
 #include "chrome/common/notification_registrar.h"
 #include "googleurl/src/gurl.h"
 
 class NavigationController;
 class ProvisionalLoadDetails;
+class TabContents;
 
 // Observes navigation notifications and routes them as events to the extension
 // system.
 class ExtensionWebNavigationEventRouter : public NotificationObserver {
  public:
   // Single instance of the event router.
   static ExtensionWebNavigationEventRouter* GetInstance();
 
   void Init();
 
@@ skipping 31 matching lines @@
                      const char* event_name,
                      const std::string& json_args);
 
   // Used for tracking registrations to navigation notifications.
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionWebNavigationEventRouter);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBNAVIGATION_API_H_