Delete the GTK+ port of Chrome.

ui/native_theme/fallback_theme.cc

 // 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.
 
 #include "ui/native_theme/fallback_theme.h"
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "ui/gfx/color_utils.h"
-#include "ui/gfx/skia_utils_gtk.h"
 #include "ui/native_theme/common_theme.h"
 
 namespace ui {
 
 FallbackTheme::FallbackTheme() {
 }
 
 FallbackTheme::~FallbackTheme() {
 }
 
@@ skipping 223 matching lines @@
       return kMenuBackgroundColor;
     case kColorId_MenuBorderColor:
       NOTREACHED();
       break;
   }
 
   return kInvalidColorIdColor;
 }
 
 }  // namespace ui