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

chrome/browser/ui/cocoa/cocoa_test_helper.h

-// 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.
-
-#ifndef CHROME_BROWSER_UI_COCOA_COCOA_TEST_HELPER_H_
-#define CHROME_BROWSER_UI_COCOA_COCOA_TEST_HELPER_H_
-
-#import <Cocoa/Cocoa.h>
-
-#import "ui/gfx/test/ui_cocoa_test_helper.h"
-
-// A test class that all tests that depend on AppKit should inherit from.
-// Sets up paths correctly, and makes sure that any windows created in the test
-// are closed down properly by the test. If you need to inherit from a
-// different test class, but need to set up the AppKit runtime environment, you
-// can call BootstrapCocoa directly from your test class. You will have to deal
-// with windows on your own though.  Note that NSApp is initialized by
-// ChromeTestSuite.
-class CocoaTest : public ui::CocoaTest {
- public:
-  // Sets up paths correctly for unit tests. If you can't inherit from
-  // CocoaTest but are going to be using any AppKit features directly, or
-  // indirectly, you should be calling this from the c'tor or SetUp methods of
-  // your test class. Note that NSApp is initialized by ChromeTestSuite.
-  static void BootstrapCocoa();
-
-  CocoaTest();
-};
-
-#endif  // CHROME_BROWSER_UI_COCOA_COCOA_TEST_HELPER_H_