components: Remove 'ui' dependencies from json_schema and user_prefs targets.

components/user_prefs.gypi

 # Copyright (c) 2013 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.
 
 {
   'targets': [
     {
       'target_name': 'user_prefs',
       'type': '<(component)',
       'dependencies': [
         '../base/base.gyp:base',
         '../base/base.gyp:base_prefs',
         '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
         '../content/content.gyp:content_browser',
-        '../ui/gfx/gfx.gyp:gfx',
         '../ui/ui.gyp:ui',
       ],
       'include_dirs': [
         '..',
       ],
       'defines': [
         'USER_PREFS_IMPLEMENTATION',
       ],
       'sources': [
         'user_prefs/pref_registry_syncable.cc',
         'user_prefs/pref_registry_syncable.h',
         'user_prefs/user_prefs.cc',
         'user_prefs/user_prefs.h',
         'user_prefs/user_prefs_export.h',
       ],
     },
   ],
 }