Make <webview> use out-of-process iframe architecture.

extensions/browser/guest_view/web_view/web_view_guest.h

 // Copyright 2014 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 EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_GUEST_H_
 #define EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_GUEST_H_
 
 #include <vector>
 
 #include "base/observer_list.h"
@@ skipping 304 matching lines @@
   void PushWebViewStateToIOThread();
   static void RemoveWebViewStateFromIOThread(
       content::WebContents* web_contents);
 
   // Loads the |url| provided. |force_navigation| indicates whether to reload
   // the content if the provided |url| matches the current page of the guest.
   void LoadURLWithParams(const GURL& url,
                          const content::Referrer& referrer,
                          ui::PageTransition transition_type,
                          bool force_navigation);
+  content::WebContents* OpenURLFromTabForSitePerProcess(
+      content::WebContents* source, const content::OpenURLParams& params);
 
   void RequestNewWindowPermission(
       WindowOpenDisposition disposition,
       const gfx::Rect& initial_bounds,
       bool user_gesture,
       content::WebContents* new_contents);
 
   // Requests resolution of a potentially relative URL.
   GURL ResolveURL(const std::string& src);
 
@@ skipping 69 matching lines @@
   // This is used to ensure pending tasks will not fire after this object is
   // destroyed.
   base::WeakPtrFactory<WebViewGuest> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebViewGuest);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_GUEST_H_