Eliminated the last few uses of MessageLoop::QuitTask in chrome/

chrome/browser/history/history_querying_unittest.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 "base/basictypes.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
@@ skipping 103 matching lines @@
       history_->AddPage(url, test_entries[i].time, id_scope, page_id, GURL(),
                         content::PAGE_TRANSITION_LINK, history::RedirectList(),
                         history::SOURCE_BROWSED, false);
       history_->SetPageTitle(url, UTF8ToUTF16(test_entries[i].title));
       history_->SetPageContents(url, UTF8ToUTF16(test_entries[i].body));
     }
   }
 
   virtual void TearDown() {
     if (history_.get()) {
-      history_->SetOnBackendDestroyTask(new MessageLoop::QuitTask);
+      history_->SetOnBackendDestroyTask(MessageLoop::QuitClosure());
       history_->Cleanup();
       history_ = NULL;
       MessageLoop::current()->Run();  // Wait for the other thread.
     }
   }
 
   void QueryHistoryComplete(HistoryService::Handle, QueryResults* results) {
     results->Swap(&last_query_results_);
     MessageLoop::current()->Quit();  // Will return out to QueryHistory.
   }
@@ skipping 209 matching lines @@
   QueryOptions options;
   QueryResults results;
 
   QueryHistory("Other", options, &results);
   EXPECT_EQ(1, results.urls().size());
   EXPECT_TRUE(NthResultIs(results, 0, 4));
 }
 */
 
 }  // namespace history