Refactor media stream infobar delegate code and also fix a typo

chrome/browser/ui/media_stream_infobar_delegate.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 <algorithm>
 #include <functional>
 
 #include "base/logging.h"
 #include "chrome/browser/ui/media_stream_infobar_delegate.h"
 #include "content/public/common/media_stream_request.h"
@@ skipping 117 matching lines @@
 gfx::Image* MediaStreamInfoBarDelegate::GetIcon() const {
   return &ResourceBundle::GetSharedInstance().GetNativeImageNamed(has_video_ ?
       IDR_INFOBAR_MEDIA_STREAM_CAMERA : IDR_INFOBAR_MEDIA_STREAM_MIC);
 }
 
 InfoBarDelegate::Type MediaStreamInfoBarDelegate::GetInfoBarType() const {
   return PAGE_ACTION_TYPE;
 }
 
 MediaStreamInfoBarDelegate*
-    MediaStreamInfoBarDelegate::AsMediaStreamInfobarDelegate() {
+    MediaStreamInfoBarDelegate::AsMediaStreamInfoBarDelegate() {
   return this;
 }