Move the CSS Device Adaptation @viewport rule support behind a runtime flag

Source/core/page/UseCounter.cpp

 /*
  * Copyright (C) 2012 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 450 matching lines @@
     case CSSPropertyWebkitBlendMode: return 399;
     case CSSPropertyWebkitBackgroundBlendMode: return 400;
 #endif
     case CSSPropertyTextDecorationLine: return 401;
     case CSSPropertyTextDecorationStyle: return 402;
     case CSSPropertyTextDecorationColor: return 403;
 #if defined(ENABLE_CSS3_TEXT) && ENABLE_CSS3_TEXT
     case CSSPropertyWebkitTextAlignLast: return 404;
     case CSSPropertyWebkitTextUnderlinePosition: return 405;
 #endif
-#if defined(ENABLE_CSS_DEVICE_ADAPTATION) && ENABLE_CSS_DEVICE_ADAPTATION
     case CSSPropertyMaxZoom: return 406;
     case CSSPropertyMinZoom: return 407;
     case CSSPropertyOrientation: return 408;
     case CSSPropertyUserZoom: return 409;
-#endif
 #if defined(ENABLE_DASHBOARD_SUPPORT) && ENABLE_DASHBOARD_SUPPORT
     case CSSPropertyWebkitDashboardRegion: return 410;
 #endif
 #if defined(ENABLE_ACCELERATED_OVERFLOW_SCROLLING) && ENABLE_ACCELERATED_OVERFLOW_SCROLLING
     case CSSPropertyWebkitOverflowScrolling: return 411;
 #endif
     case CSSPropertyWebkitAppRegion: return 412;
     case CSSPropertyWebkitFilter: return 413;
     case CSSPropertyWebkitBoxDecorationBreak: return 414;
     case CSSPropertyWebkitTapHighlightColor: return 415;
@@ skipping 180 matching lines @@
 UseCounter* UseCounter::getFrom(const StyleSheetContents* sheetContents)
 {
     // FIXME: We may want to handle stylesheets that have multiple owners
     //        http://crbug.com/242125
     if (sheetContents && !sheetContents->isUserStyleSheet() && sheetContents->hasSingleOwnerNode())
         return getFrom(sheetContents->singleOwnerDocument());
     return 0;
 }
 
 } // namespace WebCore