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

chrome/browser/ui/cocoa/app_menu/menu_tracked_root_view_unittest.mm

 // 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.
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/scoped_nsobject.h"
 #import "chrome/browser/ui/cocoa/app_menu/menu_tracked_root_view.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"
 #include "testing/platform_test.h"
 #import "third_party/ocmock/OCMock/OCMock.h"
 #include "third_party/ocmock/gtest_support.h"
 
 class MenuTrackedRootViewTest : public CocoaTest {
  public:
   void SetUp() override {
     CocoaTest::SetUp();
     view_.reset([[MenuTrackedRootView alloc] init]);
@@ skipping 17 matching lines @@
                                   windowNumber:[test_window() windowNumber]
                                        context:nil
                                    eventNumber:1
                                     clickCount:1
                                       pressure:1.0];
   [view_ mouseUp:event];
 
   EXPECT_OCMOCK_VERIFY(menu);
   EXPECT_OCMOCK_VERIFY(menuItem);
 }