athena: Move the USE_ATHENA define into //chrome.

chrome/chrome_browser_ui.gypi

 # Copyright 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': {
     'chrome_browser_ui_non_ios_sources': [
       'browser/ui/accelerator_utils.h',
       'browser/ui/android/android_about_app_info.cc',
       'browser/ui/android/android_about_app_info.h',
@@ skipping 2711 matching lines @@
           ],
           'conditions': [
             ['chromeos == 0', {
               'sources': [ '<@(chrome_browser_ui_ash_non_chromeos)' ],
             }],
           ],
         }, { # use_ash==0
           'sources': [ '<@(chrome_browser_ui_non_ash_sources)' ],
         }],
         ['use_athena==1', {
+          'defines': ['USE_ATHENA=1'],
           'sources': [ '<@(chrome_browser_ui_athena_sources)' ],
           'dependencies': [
             '<(DEPTH)/athena/athena.gyp:athena_lib',
             '<(DEPTH)/athena/athena.gyp:athena_chrome_lib',
             '<(DEPTH)/athena/athena.gyp:athena_content_lib',
             '<(DEPTH)/athena/main/athena_main.gyp:athena_main_lib',
           ],
         }],
         ['toolkit_views==1', {
           'sources': [ '<@(chrome_browser_ui_views_sources)' ],
@@ skipping 245 matching lines @@
         }],
         ['OS!="android" and OS!="ios"', {
           'dependencies': [
             '../device/bluetooth/bluetooth.gyp:device_bluetooth',
           ],
         }],
       ],
     },
   ],
 }