<webview>: Allocate the view instance ID from the WebView shim

chrome/browser/extensions/extension_renderer_state.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 CHROME_BROWSER_EXTENSIONS_EXTENSION_RENDERER_STATE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_RENDERER_STATE_H_
 
 #include <map>
 #include <set>
 #include <utility>
 
 #include "base/basictypes.h"
 #include "base/memory/singleton.h"
 
 class WebViewGuest;
 
 // This class keeps track of renderer state for use on the IO thread. All
 // methods should be called on the IO thread except for Init and Shutdown.
 class ExtensionRendererState {
  public:
   struct WebViewInfo {
     int embedder_process_id;
     int embedder_routing_id;
-    int guest_instance_id;
     int instance_id;
   };
 
   static ExtensionRendererState* GetInstance();
 
   // These are called on the UI thread to start and stop listening to tab
   // notifications.
   void Init();
   void Shutdown();
 
@@ skipping 34 matching lines @@
   void RemoveWebView(int render_process_host_id, int routing_id);
 
   TabObserver* observer_;
   TabAndWindowIdMap map_;
   WebViewInfoMap webview_info_map_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionRendererState);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_RENDERER_STATE_H_