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

chrome/browser/ui/cocoa/hover_close_button_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/mac/scoped_nsobject.h"
-#import "chrome/browser/ui/cocoa/cocoa_test_helper.h"
 #import "chrome/browser/ui/cocoa/hover_close_button.h"
+#import "chrome/browser/ui/cocoa/test/cocoa_test_helper.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class HoverCloseButtonTest : public CocoaTest {
  public:
   HoverCloseButtonTest() {
     NSRect content_frame = [[test_window() contentView] frame];
     button_.reset([[HoverCloseButton alloc] initWithFrame:content_frame]);
     [[test_window() contentView] addSubview:button_];
   }
 
  protected:
   base::scoped_nsobject<HoverCloseButton> button_;
 };
 
 class WebUIHoverCloseButtonTest : public CocoaTest {
  public:
   WebUIHoverCloseButtonTest() {
     NSRect content_frame = [[test_window() contentView] frame];
     button_.reset([[WebUIHoverCloseButton alloc] initWithFrame:content_frame]);
     [[test_window() contentView] addSubview:button_];
   }
 
  protected:
   base::scoped_nsobject<WebUIHoverCloseButton> button_;
 };
 
 TEST_VIEW(HoverCloseButtonTest, button_)
 
 TEST_VIEW(WebUIHoverCloseButtonTest, button_)