Remove Battery Status API support code from Blink

Source/core/features.gypi

 #
 # Copyright (C) 2009 Google Inc. All rights reserved.
 # 
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 # 
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 14 matching lines @@
 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #
 
 {
   # The following defines turn WebKit features on and off.
   'variables': {
     'feature_defines': [
-      'ENABLE_BATTERY_STATUS=0',
       'ENABLE_CANVAS_USES_MAILBOX=0', # Requires crbug.com/230137 to be fixed
       'ENABLE_CSS3_TEXT=0',
       'ENABLE_CSS_DEVICE_ADAPTATION=0',
       'ENABLE_CSS_EXCLUSIONS=1',
       'ENABLE_CSS_REGIONS=1',
       'ENABLE_CUSTOM_SCHEME_HANDLER=0',
       'ENABLE_ENCRYPTED_MEDIA_V2=1',
       'ENABLE_GRAPHICS_CONTEXT_ANNOTATIONS=<(enable_graphics_context_annotations)',
       'ENABLE_SVG_FONTS=1',
       'ENABLE_TOUCH_ICON_LOADING=<(enable_touch_icon_loading)',
@@ skipping 83 matching lines @@
         ],
       }],
       ['use_default_render_theme==1', {
         'feature_defines': [
           'ENABLE_DEFAULT_RENDER_THEME=1',
         ],
       }],
     ],
   },
 }