sensors: Remove prototype implementation

chrome/chrome_browser.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 3208 matching lines @@
         'browser/ui/views/ash/launcher/launcher_app_icon_loader.cc',
         'browser/ui/views/ash/launcher/launcher_app_icon_loader.h',
         'browser/ui/views/ash/launcher/launcher_context_menu.cc',
         'browser/ui/views/ash/launcher/launcher_context_menu.h',
         'browser/ui/views/ash/launcher/launcher_favicon_loader.cc',
         'browser/ui/views/ash/launcher/launcher_favicon_loader.h',
         'browser/ui/views/ash/launcher/launcher_updater.cc',
         'browser/ui/views/ash/launcher/launcher_updater.h',
         'browser/ui/views/ash/panel_view_aura.cc',
         'browser/ui/views/ash/panel_view_aura.h',
-        'browser/ui/views/ash/screen_orientation_listener.cc',
-        'browser/ui/views/ash/screen_orientation_listener.h',
         'browser/ui/views/ash/screenshot_taker.cc',
         'browser/ui/views/ash/screenshot_taker.h',
         'browser/ui/views/ash/user_gesture_handler.cc',
         'browser/ui/views/ash/user_gesture_handler.h',
         'browser/ui/views/ash/volume_controller_chromeos.cc',
         'browser/ui/views/ash/volume_controller_chromeos.h',
         'browser/ui/views/ash/window_positioner.cc',
         'browser/ui/views/ash/window_positioner.h',
         'browser/ui/views/autocomplete/autocomplete_popup_contents_view.cc',
         'browser/ui/views/autocomplete/autocomplete_popup_contents_view.h',
@@ skipping 2014 matching lines @@
       'type': 'static_library',
       'sources': [ 'browser/chromeos/gdata/gdata.proto' ],
       'variables': {
         'proto_in_dir': 'browser/chromeos/gdata',
         'proto_out_dir': 'chrome/browser/chromeos/gdata',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }