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

chrome/browser/ui/cocoa/hung_renderer_controller_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 "chrome/browser/ui/cocoa/cocoa_test_helper.h"
 #import "chrome/browser/ui/cocoa/hung_renderer_controller.h"
+#include "chrome/browser/ui/cocoa/test/cocoa_test_helper.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 
 namespace {
 
 class HungRendererControllerTest : public CocoaTest {
  public:
   void SetUp() override {
     CocoaTest::SetUp();
     hung_renderer_controller_ = [[HungRendererController alloc]
@@ skipping 21 matching lines @@
 TEST_F(HungRendererControllerTest, TestWaitButton) {
   // We can't test waiting because we have no running process to wait
   // for, but we can make sure that pressing the wait button closes
   // the window.
   [hung_renderer_controller_ showWindow:nil];
   [[hung_renderer_controller_ waitButton] performClick:nil];
 }
 
 }  // namespace