Make ui_controls only usable from interactive_ui_tests. This has two benefits:

ui/ui.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     'ui_resources.gypi',
@@ skipping 514 matching lines @@
         'gfx/vector2d_conversions.cc',
         'gfx/vector2d_conversions.h',
         'gfx/vector2d_f.cc',
         'gfx/vector2d_f.h',
         'gfx/vector3d_f.cc',
         'gfx/vector3d_f.h',
         'gfx/video_decode_acceleration_support_mac.h',
         'gfx/video_decode_acceleration_support_mac.mm',
         'notifications/notification_types.h',
         'notifications/notification_types.cc',
-        'ui_controls/ui_controls.h',
-        'ui_controls/ui_controls_aura.cc',
-        'ui_controls/ui_controls_gtk.cc',
-        'ui_controls/ui_controls_internal_win.cc',
-        'ui_controls/ui_controls_internal_win.h',
-        'ui_controls/ui_controls_mac.mm',
-        'ui_controls/ui_controls_win.cc',
       ],
       'target_conditions': [
         ['OS == "ios"', {
           'sources/': [
             ['include', '^base/l10n/l10n_util_mac\\.mm$'],
           ],
         }],
       ],
       'conditions': [
         ['OS!="ios"', {
@@ skipping 48 matching lines @@
             ['exclude', 'base/dialogs/select_file_dialog_mac.mm'],
             ['exclude', 'base/dialogs/select_file_dialog_win.cc'],
             ['exclude', 'base/work_area_watcher_observer.h'],
             ['exclude', 'base/x/active_window_watcher_x.cc'],
             ['exclude', 'base/x/active_window_watcher_x.h'],
             ['exclude', 'base/x/active_window_watcher_x_observer.h'],
             ['exclude', 'base/x/root_window_property_watcher_x.cc'],
             ['exclude', 'base/x/root_window_property_watcher_x.h'],
             ['exclude', 'base/x/work_area_watcher_x.cc'],
             ['exclude', 'base/x/work_area_watcher_x.h'],
-            ['exclude', 'ui_controls_win.cc'],
            ],
         }, {  # use_aura!=1
           'sources!': [
             'base/cursor/cursor.cc',
             'base/cursor/cursor.h',
             'base/cursor/cursor_loader_x11.cc',
             'base/cursor/cursor_loader_x11.h',
             'base/cursor/cursor_win.cc',
             'base/cursor/cursor_x11.cc',
           ]
@@ skipping 275 matching lines @@
            },
            'dependencies': [
              '../base/base.gyp:base_java',
            ],
            'includes': [ '../build/java.gypi' ],
          },
        ],
     }],
   ],
 }