components: Extract pref_registry component out of user_prefs.

apps/shell/app_shell.gyp

 # Copyright 2014 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 53 matching lines @@
     },
     {
       'target_name': 'app_shell_lib',
       'type': 'static_library',
       'defines!': ['CONTENT_IMPLEMENTATION'],
       'dependencies': [
         'app_shell_pak',
         '<(DEPTH)/apps/shell/common/api/api.gyp:shell_api',
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/base/base.gyp:base_prefs_test_support',
+        '<(DEPTH)/components/components.gyp:pref_registry',
+        '<(DEPTH)/components/components.gyp:user_prefs',
         '<(DEPTH)/content/content.gyp:content',
         '<(DEPTH)/content/content.gyp:content_gpu',
         '<(DEPTH)/content/content.gyp:content_ppapi_plugin',
         '<(DEPTH)/content/content.gyp:content_worker',
         '<(DEPTH)/content/content_shell_and_tests.gyp:content_shell_lib',
         '<(DEPTH)/extensions/common/api/api.gyp:extensions_api',
         '<(DEPTH)/extensions/extensions.gyp:extensions_browser',
         '<(DEPTH)/extensions/extensions.gyp:extensions_common',
         '<(DEPTH)/extensions/extensions.gyp:extensions_renderer',
         '<(DEPTH)/extensions/extensions_resources.gyp:extensions_resources',
@@ skipping 115 matching lines @@
         'browser/shell_browsertest.cc',
         'test/shell_test.h',
         'test/shell_test.cc',
         'test/shell_test_launcher_delegate.cc',
         'test/shell_test_launcher_delegate.h',
         'test/shell_tests_main.cc',
       ],
     },
   ],  # targets
 }