Remove remaining calls to deprecated MessageLoop methods on Mac.

chrome/browser/ui/cocoa/download/download_shelf_controller_unittest.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/download/download_shelf_controller.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include <memory>
 #include <utility>
 
 #import "base/mac/scoped_block.h"
 #import "base/mac/scoped_nsobject.h"
+#include "base/run_loop.h"
 #include "chrome/browser/download/download_shelf.h"
 #include "chrome/browser/ui/cocoa/cocoa_profile_test.h"
 #import "chrome/browser/ui/cocoa/download/download_item_controller.h"
 #import "chrome/browser/ui/cocoa/view_resizer_pong.h"
 #include "content/public/test/mock_download_item.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 #import "third_party/ocmock/OCMock/OCMock.h"
 #import "third_party/ocmock/gtest_support.h"
 #import "ui/events/test/cocoa_test_event_utils.h"
@@ skipping 360 matching lines @@
   EXPECT_EQ(3, shelf_.get()->cancelAutoCloseCount_);
   shelf_.reset();
 }
 
 // The view should not be hidden when the shelf is shown.
 // The view should be hidden after the closing animation.
 TEST_F(DownloadShelfControllerTest, ViewVisibility) {
   [shelf_ showDownloadShelf:YES isUserAction:NO];
   EXPECT_FALSE([[shelf_ view] isHidden]);
 
+  base::RunLoop run_loop;
+  base::RunLoop* const run_loop_ptr = &run_loop;
+
   [shelf_ setCloseAnimationHandler:^{
-      base::MessageLoop::current()->QuitNow();
+    run_loop_ptr->Quit();
   }];
   [shelf_ showDownloadShelf:NO isUserAction:NO];
-  base::MessageLoop::current()->Run();
+  run_loop.Run();
   EXPECT_TRUE([[shelf_ view] isHidden]);
 
   [shelf_ showDownloadShelf:YES isUserAction:NO];
   EXPECT_FALSE([[shelf_ view] isHidden]);
 }
 
 }  // namespace