Add RetainedRef uses where needed.

components/drive/file_system/search_operation.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 "components/drive/file_system/search_operation.h"
 
 #include <stddef.h>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 127 matching lines @@
     // Short cut. If the resource entry is empty, we don't need to refresh
     // the resource metadata.
     callback.Run(FILE_ERROR_OK, next_url, std::move(result));
     return;
   }
 
   // ResolveSearchResultOnBlockingPool() may add entries newly created on the
   // server to the local metadata.
   // This may race with sync tasks so we should ask LoaderController here.
   std::vector<SearchResultInfo>* result_ptr = result.get();
-  loader_controller_->ScheduleRun(base::Bind(
-      base::IgnoreResult(
-          &base::PostTaskAndReplyWithResult<FileError, FileError>),
-      blocking_task_runner_,
-      FROM_HERE,
-      base::Bind(&ResolveSearchResultOnBlockingPool,
-                 metadata_,
-                 base::Passed(&file_list),
-                 result_ptr),
-      base::Bind(&SearchOperation::SearchAfterResolveSearchResult,
-                 weak_ptr_factory_.GetWeakPtr(),
-                 callback,
-                 next_url,
-                 base::Passed(&result))));
+  loader_controller_->ScheduleRun(
+      base::Bind(base::IgnoreResult(
+                     &base::PostTaskAndReplyWithResult<FileError, FileError>),
+                 base::RetainedRef(blocking_task_runner_), FROM_HERE,
+                 base::Bind(&ResolveSearchResultOnBlockingPool, metadata_,
+                            base::Passed(&file_list), result_ptr),
+                 base::Bind(&SearchOperation::SearchAfterResolveSearchResult,
+                            weak_ptr_factory_.GetWeakPtr(), callback, next_url,
+                            base::Passed(&result))));
 }
 
 void SearchOperation::SearchAfterResolveSearchResult(
     const SearchCallback& callback,
     const GURL& next_link,
     scoped_ptr<std::vector<SearchResultInfo> > result,
     FileError error) {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(!callback.is_null());
   DCHECK(result);
 
   if (error != FILE_ERROR_OK) {
     callback.Run(error, GURL(), scoped_ptr<std::vector<SearchResultInfo> >());
     return;
   }
 
   callback.Run(error, next_link, std::move(result));
 }
 
 }  // namespace file_system
 }  // namespace drive