Move DefaultActivationClient to wm/core

ui/wm/wm.gyp

 # Copyright 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': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 16 matching lines @@
       ],
       'sources': [
         'core/base_focus_rules.cc',
         'core/base_focus_rules.h',
         'core/capture_controller.cc',
         'core/capture_controller.h',
         'core/compound_event_filter.cc',
         'core/compound_event_filter.h',
         'core/cursor_manager.cc',
         'core/cursor_manager.h',
+        'core/default_activation_client.cc',
+        'core/default_activation_client.h',
         'core/easy_resize_window_targeter.cc',
         'core/easy_resize_window_targeter.h',
         'core/focus_controller.cc',
         'core/focus_controller.h',
         'core/focus_rules.h',
         'core/image_grid.cc',
         'core/image_grid.h',
         'core/input_method_event_filter.cc',
         'core/input_method_event_filter.h',
         'core/masked_window_targeter.cc',
@@ skipping 76 matching lines @@
         'core/transient_window_manager_unittest.cc',
         'core/transient_window_stacking_client_unittest.cc',
         'core/user_activity_detector_unittest.cc',
         'core/visibility_controller_unittest.cc',
         'core/window_animations_unittest.cc',
         'core/window_util_unittest.cc',
       ],
     },
   ],
 }