Add download button to MediaDocument on Android.

third_party/WebKit/public/platform/WebLocalizedString.h

 /*
  * 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 87 matching lines @@
         AXWebAreaText, // Deprecated.
         AXWeekOfYearFieldText,
         AXYearFieldText,
         BlockedPluginText,
         CalendarClear,
         CalendarToday,
         DateFormatDayInMonthLabel,
         DateFormatMonthLabel,
         DateFormatYearLabel,
         DetailsLabel,
+        DownloadButtonLabel,
         FileButtonChooseFileLabel,
         FileButtonChooseMultipleFilesLabel,
         FileButtonNoFileSelectedLabel,
         InputElementAltText,
         KeygenMenuHighGradeKeySize,
         KeygenMenuMediumGradeKeySize,
         MissingPluginText,
         MultipleFileUploadText,
         OtherColorLabel,
         OtherDateLabel,
@@ skipping 50 matching lines @@
         ValidationValueMissingForRadio,
         ValidationValueMissingForSelect,
         WeekFormatTemplate,
         WeekNumberLabel,
     };
 };
 
 } // namespace blink
 
 #endif