Create c/b/ui/cocoa/test and move test files to there

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

 // Copyright 2014 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_item_controller.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include <memory>
 
 #import "base/mac/scoped_nsobject.h"
 #include "base/run_loop.h"
-#include "chrome/browser/ui/cocoa/cocoa_profile_test.h"
 #import "chrome/browser/ui/cocoa/download/download_item_button.h"
 #import "chrome/browser/ui/cocoa/download/download_shelf_controller.h"
+#include "chrome/browser/ui/cocoa/test/cocoa_profile_test.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"
 
 using ::testing::Return;
 using ::testing::ReturnRefOfCopy;
 
 @interface DownloadItemController (DownloadItemControllerTest)
@@ skipping 156 matching lines @@
     // download item are mock objects.
     [downloadItemButton removeFromSuperview];
   }];
   // The unit test will stop here until the block causes the DownloadItemButton
   // to dismiss the menu.
   [item showContextMenu:nil];
 }
 
 
 }  // namespace