Pass result of blockage across content API when new tab blocked.

chrome/browser/extensions/extension_host.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 CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 141 matching lines @@
   virtual void HandleKeyboardEvent(
       content::WebContents* source,
       const content::NativeWebKeyboardEvent& event) OVERRIDE;
   virtual void ResizeDueToAutoResize(content::WebContents* source,
                                      const gfx::Size& new_size) OVERRIDE;
   virtual content::JavaScriptDialogCreator*
       GetJavaScriptDialogCreator() OVERRIDE;
   virtual void RunFileChooser(
       content::WebContents* tab,
       const content::FileChooserParams& params) OVERRIDE;
-  virtual void AddNewContents(content::WebContents* source,
+  virtual bool AddNewContents(content::WebContents* source,
                               content::WebContents* new_contents,
                               WindowOpenDisposition disposition,
                               const gfx::Rect& initial_pos,
                               bool user_gesture) OVERRIDE;
   virtual void CloseContents(content::WebContents* contents) OVERRIDE;
   virtual void OnStartDownload(content::WebContents* source,
                                content::DownloadItem* download) OVERRIDE;
   virtual void WebIntentDispatch(
       content::WebContents* web_contents,
       content::WebIntentsDispatcher* intents_dispatcher) OVERRIDE;
@@ skipping 85 matching lines @@
 
   // Used to measure how long it's been since the host was created.
   PerfTimer since_created_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionHost);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_