ash/wm: Remove dead code.

ui/wm/wm.gyp

Index: ui/wm/wm.gyp
diff --git a/ui/wm/wm.gyp b/ui/wm/wm.gyp
index 28a8cb28f4ef9bb757d4c2c6dc3f6c1782fcaa4c..685c9769addeafff755f4935d1f68bb69e29f73a 100644
--- a/ui/wm/wm.gyp
+++ b/ui/wm/wm.gyp
@@ -60,13 +60,6 @@
         'core/masked_window_targeter.h',
         'core/native_cursor_manager.h',
         'core/native_cursor_manager_delegate.h',
-        'core/nested_accelerator_controller.cc',
-        'core/nested_accelerator_controller.h',
-        'core/nested_accelerator_delegate.h',
-        'core/nested_accelerator_dispatcher.cc',
-        'core/nested_accelerator_dispatcher.h',
-        'core/nested_accelerator_dispatcher_linux.cc',
-        'core/nested_accelerator_dispatcher_win.cc',
         'core/shadow.cc',
         'core/shadow.h',
         'core/shadow_controller.cc',
@@ -100,15 +93,6 @@
             '../../build/linux/system.gyp:x11',
           ],
         }],
-        ['OS=="android"', {
-          'sources!': [
-            'core/nested_accelerator_controller.cc',
-            'core/nested_accelerator_controller.h',
-            'core/nested_accelerator_delegate.h',
-            'core/nested_accelerator_dispatcher.cc',
-            'core/nested_accelerator_dispatcher.h',
-          ],
-        }],
       ],
     },
     {
@@ -154,7 +138,6 @@
         'core/cursor_manager_unittest.cc',
         'core/focus_controller_unittest.cc',
         'core/image_grid_unittest.cc',
-        'core/nested_accelerator_controller_unittest.cc',
         'core/shadow_controller_unittest.cc',
         'core/shadow_unittest.cc',
         'core/transient_window_manager_unittest.cc',