Remove implicit conversions from scoped_refptr to T* in chrome/

chrome/browser/history/history_service.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.
 
 // The history system runs on a background thread so that potentially slow
 // database operations don't delay the browser. This backend processing is
 // represented by HistoryBackend. The HistoryService's job is to dispatch to
 // that thread.
 //
 // Main thread                       History thread
@@ skipping 223 matching lines @@
 void HistoryService::Cleanup() {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (!thread_) {
     // We've already cleaned up.
     return;
   }
 
   weak_ptr_factory_.InvalidateWeakPtrs();
 
   // Unload the backend.
-  if (history_backend_) {
+  if (history_backend_.get()) {
     // Get rid of the in-memory backend.
     in_memory_backend_.reset();
 
     // Give the InMemoryURLIndex a chance to shutdown.
     // NOTE: In tests, there may be no index.
     if (in_memory_url_index_)
       in_memory_url_index_->ShutDown();
 
     // The backend's destructor must run on the history thread since it is not
     // threadsafe. So this thread must not be the last thread holding a
@@ skipping 967 matching lines @@
   DCHECK(thread_checker_.CalledOnValidThread());
   visit_database_observers_.RemoveObserver(observer);
 }
 
 void HistoryService::NotifyVisitDBObserversOnAddVisit(
     const history::BriefVisitInfo& info) {
   DCHECK(thread_checker_.CalledOnValidThread());
   FOR_EACH_OBSERVER(history::VisitDatabaseObserver, visit_database_observers_,
                     OnAddVisit(info));
 }