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

content/shell/shell.cc

 // 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.
 
 #include "content/shell/shell.h"
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/message_loop.h"
 #include "base/path_service.h"
@@ skipping 177 matching lines @@
 
 void Shell::LoadingStateChanged(WebContents* source) {
   UpdateNavigationControls();
   PlatformSetIsLoading(source->IsLoading());
 }
 
 void Shell::CloseContents(WebContents* source) {
   Close();
 }
 
-void Shell::WebContentsCreated(WebContents* source_contents,
+bool Shell::WebContentsCreated(WebContents* source_contents,
                                int64 source_frame_id,
                                const GURL& target_url,
                                WebContents* new_contents) {
   CreateShell(new_contents);
+  return true;
 }
 
 void Shell::DidNavigateMainFramePostCommit(WebContents* web_contents) {
   PlatformSetAddressBarURL(web_contents->GetURL());
 }
 
 JavaScriptDialogCreator* Shell::GetJavaScriptDialogCreator() {
   if (!dialog_creator_.get())
     dialog_creator_.reset(new ShellJavaScriptDialogCreator());
   return dialog_creator_.get();
@@ skipping 23 matching lines @@
         Details<std::pair<NavigationEntry*, bool> >(details).ptr();
 
     if (title->first) {
       string16 text = title->first->GetTitle();
       PlatformSetTitle(text);
     }
   }
 }
 
 }  // namespace content