Revert of Revert of views: Move TOOLKIT_VIEWS definition in //ui/views/ from root.

chrome/chrome_browser_extensions.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.
 
 {
   'variables': {
     'chrome_browser_extensions_chromeos_sources': [
       'browser/extensions/api/enterprise_platform_keys/enterprise_platform_keys_api.cc',
       'browser/extensions/api/enterprise_platform_keys/enterprise_platform_keys_api.h',
       'browser/extensions/api/enterprise_platform_keys_private/enterprise_platform_keys_private_api.cc',
@@ skipping 1000 matching lines @@
             'browser/extensions/api/tabs/ash_panel_contents.cc',
             'browser/extensions/api/tabs/ash_panel_contents.h',
           ],
         }],
         ['use_aura==1', {
           'dependencies': [
             '../ui/keyboard/keyboard.gyp:keyboard',
             '../ui/keyboard/keyboard.gyp:keyboard_resources',
           ],
         }],
+        ['toolkit_views==1', {
+          'dependencies': [
+            '../ui/views/views.gyp:views',
+          ],
+        }],
         ['OS=="linux"', {
           'conditions': [
             ['use_aura==1', {
               'dependencies': [
                 '../build/linux/system.gyp:dbus',
                 '../build/linux/system.gyp:fontconfig',
                 '../dbus/dbus.gyp:dbus',
               ],
             }],
             # x11 build
@@ skipping 85 matching lines @@
           ],
         }, {  # use_brlapi==0
           'sources': [
             'browser/extensions/api/braille_display_private/braille_controller_stub.cc',
           ],
         }],
       ],
     },
   ],
 }