Remove implicit conversions from scoped_refptr to T* in chrome/browser/sync_file_system/

chrome/browser/sync_file_system/local/sync_file_system_backend.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/sync_file_system/local/sync_file_system_backend.h"
 
 #include "base/logging.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/sync_file_system/local/local_file_change_tracker.h"
 #include "chrome/browser/sync_file_system/local/local_file_sync_context.h"
@@ skipping 212 matching lines @@
   delegate->AddFileUpdateObserver(storage::kFileSystemTypeSyncable,
                                   change_tracker_.get(),
                                   delegate->file_task_runner());
   delegate->AddFileChangeObserver(storage::kFileSystemTypeSyncable,
                                   change_tracker_.get(),
                                   delegate->file_task_runner());
 }
 
 void SyncFileSystemBackend::set_sync_context(
     LocalFileSyncContext* sync_context) {
-  DCHECK(!sync_context_);
+  DCHECK(!sync_context_.get());
   sync_context_ = sync_context;
 }
 
 storage::SandboxFileSystemBackendDelegate* SyncFileSystemBackend::GetDelegate()
     const {
   DCHECK(context_);
   DCHECK(context_->sandbox_delegate());
   return context_->sandbox_delegate();
 }
 
@@ skipping 47 matching lines @@
                  SyncStatusCodeToFileError(status));
     return;
   }
 
   callback.Run(GetSyncableFileSystemRootURI(origin_url),
                GetFileSystemName(origin_url, type),
                base::File::FILE_OK);
 }
 
 }  // namespace sync_file_system