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

chrome/browser/ui/browser.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 "chrome/browser/ui/browser.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <shellapi.h>
 #endif  // OS_WIN
@@ skipping 1283 matching lines @@
 
   // We can synchronously update commands since they will only change once per
   // navigation, so we don't have to worry about flickering. We do, however,
   // need to update the command state early on load to always present usable
   // actions in the face of slow-to-commit pages.
   if (changed_flags & (content::INVALIDATE_TYPE_URL |
                        content::INVALIDATE_TYPE_LOAD))
     command_controller_->TabStateChanged();
 }
 
-void Browser::AddNewContents(WebContents* source,
+bool Browser::AddNewContents(WebContents* source,
                              WebContents* new_contents,
                              WindowOpenDisposition disposition,
                              const gfx::Rect& initial_pos,
                              bool user_gesture) {
-  chrome::AddWebContents(this, source, new_contents, disposition, initial_pos,
-                         user_gesture);
+  return chrome::AddWebContents(
+      this, source, new_contents, disposition, initial_pos, user_gesture);
 }
 
 void Browser::ActivateContents(WebContents* contents) {
   chrome::ActivateTabAt(this, tab_strip_model_->GetIndexOfWebContents(contents),
                         false);
   window_->Activate();
 }
 
 void Browser::DeactivateContents(WebContents* contents) {
   window_->Deactivate();
@@ skipping 974 matching lines @@
   if (contents && !allow_js_access) {
     contents->web_contents()->GetController().LoadURL(
         target_url,
         content::Referrer(),
         content::PAGE_TRANSITION_LINK,
         std::string());  // No extra headers.
   }
 
   return contents != NULL;
 }