Move the concept of Activation to the Shell.

ui/aura/aura.gyp

 # Copyright (c) 2011 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': [
     {
       'target_name': 'aura',
       'type': '<(component)',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/base.gyp:base_i18n',
         '../../skia/skia.gyp:skia',
         '../gfx/compositor/compositor.gyp:compositor',
         '../ui.gyp:gfx_resources',
         '../ui.gyp:ui',
         '../ui.gyp:ui_resources',
       ],
       'defines': [
         'AURA_IMPLEMENTATION',
       ],
       'sources': [
         'aura_switches.cc',
         'aura_switches.h',
+        'client/activation_client.cc',
+        'client/activation_client.h',
+        'client/activation_delegate.cc',
+        'client/activation_delegate.h',
         'client/aura_constants.cc',
         'client/aura_constants.h',
         'client/drag_drop_client.h',
         'client/stacking_client.h',
         'client/tooltip_client.h',
         'client/window_drag_drop_delegate.h',
         'cursor.h',
         'root_window_host.h',
         'root_window_host_linux.cc',
         'root_window_host_win.cc',
@@ skipping 26 matching lines @@
         'aura',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'test/aura_test_base.cc',
         'test/aura_test_base.h',
         'test/event_generator.cc',
         'test/event_generator.h',
+        'test/test_activation_client.cc',
+        'test/test_activation_client.h',
         'test/test_event_filter.cc',
         'test/test_event_filter.h',
         'test/test_stacking_client.cc',
         'test/test_stacking_client.h',
         'test/test_windows.cc',
         'test/test_windows.h',
         'test/test_window_delegate.cc',
         'test/test_window_delegate.h',
       ],
       'conditions': [
@@ skipping 71 matching lines @@
           ],
         }, { # use_webkit_compositor!=1
           'dependencies': [
             '../gfx/compositor/compositor.gyp:test_compositor',
           ],
         }],
       ],
     },
   ],
 }