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

chrome/browser/ui/cocoa/constrained_window/constrained_window_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 "base/mac/scoped_nsobject.h"
-#import "chrome/browser/ui/cocoa/cocoa_test_helper.h"
 #import "chrome/browser/ui/cocoa/constrained_window/constrained_window_button.h"
+#import "chrome/browser/ui/cocoa/test/cocoa_test_helper.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 #import "ui/events/test/cocoa_test_event_utils.h"
 
 class ConstrainedWindowButtonTest : public CocoaTest {
  public:
   ConstrainedWindowButtonTest() {
     NSRect frame = NSMakeRect(0, 0, 50, 30);
     button_.reset([[ConstrainedWindowButton alloc] initWithFrame:frame]);
     [button_ setTitle:@"Abcdefg"];
@@ skipping 34 matching lines @@
 // Tracking rects
 TEST_F(ConstrainedWindowButtonTest, TrackingRects) {
   ConstrainedWindowButtonCell* cell = [button_ cell];
   EXPECT_FALSE([cell isMouseInside]);
 
   [button_ mouseEntered:cocoa_test_event_utils::EnterEvent()];
   EXPECT_TRUE([cell isMouseInside]);
   [button_ mouseExited:cocoa_test_event_utils::ExitEvent()];
   EXPECT_FALSE([cell isMouseInside]);
 }