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

chrome/browser/chromeos/swap_metrics.cc

 // Copyright 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 "chrome/browser/chromeos/swap_metrics.h"
 
 #include <string>
 #include <vector>
 
 #include "ash/shell.h"
@@ skipping 330 matching lines @@
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 SwapMetrics::SwapMetrics() : browser_(NULL) {
   ash::Shell::GetInstance()->AddPreTargetHandler(this);
   BrowserList::AddObserver(this);
 }
 
 SwapMetrics::~SwapMetrics() {
-  if (backend_)
+  if (backend_.get())
     backend_->CancelOnUIThread();
   ash::Shell::GetInstance()->RemovePreTargetHandler(this);
   BrowserList::RemoveObserver(this);
   SetBrowser(NULL);
 }
 
 void SwapMetrics::OnBrowserRemoved(Browser* browser) {
   if (browser_ == browser)
     SetBrowser(NULL);
 }
@@ skipping 44 matching lines @@
   runner->PostDelayedTask(
       FROM_HERE,
       base::Bind(&SwapMetrics::Backend::RecordMetricsOnBlockingPool,
                  backend,
                  time_index),
       base::TimeDelta::FromMilliseconds(delay_ms));
 }
 
 void SwapMetrics::StartMetricsCollection(const std::string& reason) {
   // Cancel any existing metrics run.
-  if (backend_)
+  if (backend_.get())
     backend_->CancelOnUIThread();
   backend_ = new Backend(reason);
   PostTaskRecordMetrics(backend_, 0, kMetricsDelayMs[0]);
 }
 
 void SwapMetrics::SetBrowser(Browser* browser) {
   if (browser_ == browser)
     return;
   if (browser_)
     browser_->tab_strip_model()->RemoveObserver(this);
   browser_ = browser;
   if (browser_)
     browser_->tab_strip_model()->AddObserver(this);
 }
 
 }  // namespace chromeos