Update content/ to use scoped_refptr<T>::get() rather than implicit "operator T*"

content/browser/renderer_host/media/web_contents_tracker.cc

 // Copyright (c) 2013 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/browser/renderer_host/media/web_contents_tracker.h"
 
 #include "base/message_loop_proxy.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
 
 namespace content {
 
 WebContentsTracker::WebContentsTracker() {}
 
 WebContentsTracker::~WebContentsTracker() {
   DCHECK(!web_contents()) << "BUG: Still observering!";
 }
 
 void WebContentsTracker::Start(int render_process_id, int render_view_id,
                                const ChangeCallback& callback) {
-  DCHECK(!message_loop_ || message_loop_->BelongsToCurrentThread());
+  DCHECK(!message_loop_.get() || message_loop_->BelongsToCurrentThread());
 
   message_loop_ = base::MessageLoopProxy::current();
-  DCHECK(message_loop_);
+  DCHECK(message_loop_.get());
   callback_ = callback;
 
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&WebContentsTracker::LookUpAndObserveWebContents, this,
                  render_process_id, render_view_id));
 }
 
 void WebContentsTracker::Stop() {
   DCHECK(message_loop_->BelongsToCurrentThread());
@@ skipping 56 matching lines @@
 void WebContentsTracker::DidNavigateMainFrame(
     const LoadCommittedDetails& details, const FrameNavigateParams& params) {
   OnWebContentsChangeEvent();
 }
 
 void WebContentsTracker::WebContentsDestroyed(WebContents* web_contents) {
   OnWebContentsChangeEvent();
 }
 
 }  // namespace content