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

chrome/browser/guestview/guestview.h

 // Copyright 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_GUESTVIEW_GUESTVIEW_H_
 #define CHROME_BROWSER_GUESTVIEW_GUESTVIEW_H_
 
 #include <queue>
 
 #include "base/values.h"
@@ skipping 30 matching lines @@
   };
 
   explicit GuestView(content::WebContents* guest_web_contents);
 
   static GuestView* FromWebContents(content::WebContents* web_contents);
 
   static GuestView* From(int embedder_process_id, int instance_id);
 
   virtual void Attach(content::WebContents* embedder_web_contents,
                       const std::string& extension_id,
-                      int view_instance_id,
                       const base::DictionaryValue& args);
 
   content::WebContents* embedder_web_contents() const {
     return embedder_web_contents_;
   }
 
   // Returns the guest WebContents.
   content::WebContents* guest_web_contents() const {
     return guest_web_contents_;
   }
@@ skipping 46 matching lines @@
   int view_instance_id_;
 
   // This is a queue of Events that are destined to be sent to the embedder once
   // the guest is attached to a particular embedder.
   std::queue<Event*> pending_events_;
 
   DISALLOW_COPY_AND_ASSIGN(GuestView);
 };
 
 #endif  // CHROME_BROWSER_GUESTVIEW_GUESTVIEW_H_