Move DisplayManager and DisplayChangeObserverX11 from aura to ash.

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 365 matching lines @@
         'gfx/color_analysis.cc',
         'gfx/color_analysis.h',
         'gfx/color_profile.cc',
         'gfx/color_profile.h',
         'gfx/color_profile_mac.cc',
         'gfx/color_profile_win.cc',
         'gfx/color_utils.cc',
         'gfx/color_utils.h',
         'gfx/display.cc',
         'gfx/display.h',
+        'gfx/display_observer.cc',
+        'gfx/display_observer.h',
         'gfx/favicon_size.cc',
         'gfx/favicon_size.h',
         'gfx/font.cc',
         'gfx/font.h',
         'gfx/font_fallback_win.cc',
         'gfx/font_fallback_win.h',
         'gfx/font_list.cc',
         'gfx/font_list.h',
         'gfx/font_render_params_android.cc',
         'gfx/font_render_params_linux.cc',
@@ skipping 500 matching lines @@
            },
            'dependencies': [
              '../base/base.gyp:base_java',
            ],
            'includes': [ '../build/java.gypi' ],
          },
        ],
     }],
   ],
 }