Remove implicit conversions from scoped_refptr to T* in chrome/

chrome/browser/history/history_backend.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/history/history_backend.h"
 
 #include <algorithm>
 #include <functional>
 #include <list>
 #include <map>
@@ skipping 153 matching lines @@
   scoped_refptr<HistoryBackend> history_backend_;
 };
 
 
 QueuedHistoryDBTask::QueuedHistoryDBTask(
     scoped_ptr<HistoryDBTask> task,
     scoped_refptr<base::SingleThreadTaskRunner> origin_loop,
     const base::CancelableTaskTracker::IsCanceledCallback& is_canceled)
     : task_(task.Pass()), origin_loop_(origin_loop), is_canceled_(is_canceled) {
   DCHECK(task_);
-  DCHECK(origin_loop_);
+  DCHECK(origin_loop_.get());
   DCHECK(!is_canceled_.is_null());
 }
 
 QueuedHistoryDBTask::~QueuedHistoryDBTask() {
   // Ensure that |task_| is destroyed on its origin thread.
   origin_loop_->PostTask(
       FROM_HERE,
       base::Bind(&base::DeletePointer<HistoryDBTask>,
                  base::Unretained(task_.release())));
 }
@@ skipping 2568 matching lines @@
   int rank = kPageVisitStatsMaxTopSites;
   std::map<GURL, int>::const_iterator it = most_visited_urls_map_.find(url);
   if (it != most_visited_urls_map_.end())
     rank = (*it).second;
   UMA_HISTOGRAM_ENUMERATION("History.TopSitesVisitsByRank",
                             rank, kPageVisitStatsMaxTopSites + 1);
 }
 #endif
 
 }  // namespace history