Speech Recognition API: Safeguarding against page closes during startup

chrome/browser/speech/speech_recognition_bubble_controller.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/speech/speech_recognition_bubble_controller.h"
 
 #include "base/bind.h"
 #include "chrome/browser/tab_contents/tab_util.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_registrar.h"
@@ skipping 150 matching lines @@
 
   // In the case of a tab closed or crashed, the bubble can have been destroyed
   // earlier on the UI thread, while other tasks were being enqueued from the IO
   // to the UI thread. Simply return in such cases.
   if (request.type != REQUEST_CREATE && !bubble_.get())
     return;
 
   switch (request.type) {
     case REQUEST_CREATE:
       bubble_.reset(SpeechRecognitionBubble::Create(
-          tab_util::GetWebContentsByID(request.render_process_id,
-                                       request.render_view_id),
+          request.render_process_id, request.render_view_id,
           this, request.element_rect));
 
       if (!bubble_.get()) {
         // Could be null if tab or display rect were invalid.
         // Simulate the cancel button being clicked to inform the delegate.
         BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
             base::Bind(
                 &SpeechRecognitionBubbleController::InvokeDelegateButtonClicked,
                 this, SpeechRecognitionBubble::BUTTON_CANCEL));
         return;
@@ skipping 27 matching lines @@
       volume(0.0F),
       noise_volume(0.0F),
       render_process_id(0),
       render_view_id(0) {
 }
 
 SpeechRecognitionBubbleController::UIRequest::~UIRequest() {
 }
 
 }  // namespace speech