Refactor media stream infobar delegate code and also fix a typo

chrome/browser/automation/testing_automation_provider.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/automation/testing_automation_provider.h"
 
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 2682 matching lines @@
         infobar_helper->RemoveInfoBar(infobar);
     } else if ("cancel" == action) {
       if (confirm_infobar->Cancel())
         infobar_helper->RemoveInfoBar(infobar);
     }
     reply.SendSuccess(NULL);
     return;
   }
   if ("allow" == action || "deny" == action) {
     MediaStreamInfoBarDelegate* media_stream_infobar;
-    if (!(media_stream_infobar = infobar->AsMediaStreamInfobarDelegate())) {
+    if (!(media_stream_infobar = infobar->AsMediaStreamInfoBarDelegate())) {
       reply.SendError("Not a media stream infobar.");
       return;
     }
     if ("allow" == action) {
       content::MediaStreamDevices video_devices =
           media_stream_infobar->GetVideoDevices();
       content::MediaStreamDevices audio_devices =
           media_stream_infobar->GetAudioDevices();
       if (video_devices.empty() || audio_devices.empty()) {
         reply.SendError("No available audio/video devices to autoselect.");
@@ skipping 4364 matching lines @@
       *browser_handle = browser_tracker_->Add(browser);
       *success = true;
     }
   }
 }
 
 void TestingAutomationProvider::OnRemoveProvider() {
   if (g_browser_process)
     g_browser_process->GetAutomationProviderList()->RemoveProvider(this);
 }