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

chrome/browser/ui/cocoa/chrome_browser_window_unittest.mm

 // Copyright (c) 2012 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 <Cocoa/Cocoa.h>
 
 #include "base/debug/debugger.h"
 #include "chrome/app/chrome_command_ids.h"
 #import "chrome/browser/ui/cocoa/chrome_browser_window.h"
-#import "chrome/browser/ui/cocoa/cocoa_test_helper.h"
+#import "chrome/browser/ui/cocoa/test/cocoa_test_helper.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #import "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 
 class ChromeBrowserWindowTest : public CocoaTest {
  public:
   void SetUp() override {
     CocoaTest::SetUp();
     // Create a window.
     const NSUInteger mask = NSTitledWindowMask | NSClosableWindowMask |
@@ skipping 17 matching lines @@
 
   ChromeBrowserWindow* window_;
 };
 
 // Baseline test that the window creates, displays, closes, and
 // releases.
 TEST_F(ChromeBrowserWindowTest, ShowAndClose) {
   [window_ display];
 }