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

chrome/browser/ui/cocoa/floating_bar_backing_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 "base/mac/scoped_nsobject.h"
-#import "chrome/browser/ui/cocoa/cocoa_test_helper.h"
 #import "chrome/browser/ui/cocoa/floating_bar_backing_view.h"
+#import "chrome/browser/ui/cocoa/test/cocoa_test_helper.h"
 
 namespace {
 
 class FloatingBarBackingViewTest : public CocoaTest {
  public:
   FloatingBarBackingViewTest() {
     NSRect content_frame = [[test_window() contentView] frame];
     base::scoped_nsobject<FloatingBarBackingView> view(
         [[FloatingBarBackingView alloc] initWithFrame:content_frame]);
     view_ = view.get();
     [[test_window() contentView] addSubview:view_];
   }
 
   FloatingBarBackingView* view_;  // Weak. Owned by the view hierarchy.
 };
 
 // Tests display, add/remove.
 TEST_VIEW(FloatingBarBackingViewTest, view_);
 
 }  // namespace