Move HoverButton and HoverImageButton from chrome/browser/ui/cocoa/ to ui/base/cocoa.

chrome/browser/ui/cocoa/panels/panel_titlebar_view_cocoa.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 "chrome/browser/ui/cocoa/panels/panel_titlebar_view_cocoa.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/logging.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
-#import "chrome/browser/ui/cocoa/hover_image_button.h"
 #import "chrome/browser/ui/cocoa/nsview_additions.h"
 #import "chrome/browser/ui/cocoa/panels/panel_window_controller_cocoa.h"
 #import "chrome/browser/ui/panels/panel_constants.h"
 #include "grit/generated_resources.h"
 #include "grit/theme_resources.h"
 #import "third_party/GTM/AppKit/GTMNSBezierPath+RoundRect.h"
 #import "third_party/GTM/AppKit/GTMNSColor+Luminance.h"
 #include "ui/base/l10n/l10n_util_mac.h"
+#import "ui/base/cocoa/hover_image_button.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
 #include "ui/gfx/image/image.h"
 
 const int kButtonPadding = 8;
 const int kIconAndTextPadding = 5;
 
 // 'Glint' is a glowing light animation on the titlebar to attract user's
 // attention. Numbers are arbitrary, based on several tries.
 const double kGlintAnimationDuration = 1.5;
@@ skipping 535 matching lines @@
 - (NSButton*)minimizeButton {
   return minimizeButton_;
 }
 
 - (NSButton*)restoreButton {
   return restoreButton_;
 }
 
 @end