Move shadow code to views\corewm

ash/ash.gyp

Index: ash/ash.gyp
===================================================================
--- ash/ash.gyp	(revision 167688)
+++ ash/ash.gyp	(working copy)
@@ -305,8 +305,6 @@
         'wm/gestures/two_finger_drag_handler.h',
         'wm/image_cursors.cc',
         'wm/image_cursors.h',
-        'wm/image_grid.cc',
-        'wm/image_grid.h',
         'wm/maximize_bubble_controller.cc',
         'wm/maximize_bubble_controller.h',
         'wm/overlay_event_filter.cc',
@@ -339,12 +337,6 @@
         'wm/session_state_controller_impl.h',
         'wm/session_state_controller_impl2.cc',
         'wm/session_state_controller_impl2.h',
-        'wm/shadow.cc',
-        'wm/shadow.h',
-        'wm/shadow_controller.cc',
-        'wm/shadow_controller.h',
-        'wm/shadow_types.cc',
-        'wm/shadow_types.h',
         'wm/shelf_layout_manager.cc',
         'wm/shelf_layout_manager.h',
         'wm/shelf_types.h',
@@ -562,11 +554,9 @@
         'wm/cursor_manager_unittest.cc',
         'wm/custom_frame_view_ash_unittest.cc',
         'wm/frame_painter_unittest.cc',
-        'wm/image_grid_unittest.cc',
         'wm/panel_layout_manager_unittest.cc',
         'wm/power_button_controller_unittest.cc',
         'wm/screen_dimmer_unittest.cc',
-        'wm/shadow_controller_unittest.cc',
         'wm/shelf_layout_manager_unittest.cc',
         'wm/system_gesture_event_filter_unittest.cc',
         'wm/system_modal_container_layout_manager_unittest.cc',