Call scoped_refptr<T>::get() rather than relying on implicit "operator T*"

chrome/browser/history/top_sites_backend.cc

 // Copyright (c) 2011 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/top_sites_backend.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
@@ skipping 23 matching lines @@
       base::Bind(&TopSitesBackend::ShutdownDBOnDBThread, this));
 }
 
 void TopSitesBackend::GetMostVisitedThumbnails(
       const GetMostVisitedThumbnailsCallback& callback,
       CancelableTaskTracker* tracker) {
   scoped_refptr<MostVisitedThumbnails> thumbnails = new MostVisitedThumbnails();
   bool* need_history_migration = new bool(false);
 
   tracker->PostTaskAndReply(
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::DB),
+      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::DB).get(),
       FROM_HERE,
       base::Bind(&TopSitesBackend::GetMostVisitedThumbnailsOnDBThread,
-                 this, thumbnails, need_history_migration),
+                 this,
+                 thumbnails,
+                 need_history_migration),
       base::Bind(callback, thumbnails, base::Owned(need_history_migration)));
 }
 
 void TopSitesBackend::UpdateTopSites(const TopSitesDelta& delta) {
   BrowserThread::PostTask(
       BrowserThread::DB, FROM_HERE,
       base::Bind(&TopSitesBackend::UpdateTopSitesOnDBThread, this, delta));
 }
 
 void TopSitesBackend::SetPageThumbnail(const MostVisitedURL& url,
                                        int url_rank,
                                        const Images& thumbnail) {
   BrowserThread::PostTask(
       BrowserThread::DB, FROM_HERE,
       base::Bind(&TopSitesBackend::SetPageThumbnailOnDBThread, this, url,
                  url_rank, thumbnail));
 }
 
 void TopSitesBackend::ResetDatabase() {
   BrowserThread::PostTask(
       BrowserThread::DB, FROM_HERE,
       base::Bind(&TopSitesBackend::ResetDatabaseOnDBThread, this, db_path_));
 }
 
 void TopSitesBackend::DoEmptyRequest(const base::Closure& reply,
                                      CancelableTaskTracker* tracker) {
   tracker->PostTaskAndReply(
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::DB),
+      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::DB).get(),
       FROM_HERE,
       base::Bind(&base::DoNothing),
       reply);
 }
 
 TopSitesBackend::~TopSitesBackend() {
   DCHECK(!db_);  // Shutdown should have happened first (which results in
                  // nulling out db).
 }
 
@@ skipping 48 matching lines @@
 
 void TopSitesBackend::ResetDatabaseOnDBThread(const base::FilePath& file_path) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::DB));
   db_.reset(NULL);
   file_util::Delete(db_path_, false);
   db_.reset(new TopSitesDatabase());
   InitDBOnDBThread(db_path_);
 }
 
 }  // namespace history