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

Source/core/page/FrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
@@ skipping 310 matching lines @@
     bool wheelEvent(const PlatformWheelEvent&);
 
     // Page and FrameView both store a Pagination value. Page::pagination() is set only by API,
     // and FrameView::pagination() is set only by CSS. Page::pagination() will affect all
     // FrameViews in the page cache, but FrameView::pagination() only affects the current
     // FrameView. FrameView::pagination() will return m_pagination if it has been set. Otherwise,
     // it will return Page::pagination() since currently there are no callers that need to
     // distinguish between the two.
     const Pagination& pagination() const;
     void setPagination(const Pagination&);
-    
+
     bool inProgrammaticScroll() const { return m_inProgrammaticScroll; }
     void setInProgrammaticScroll(bool programmaticScroll) { m_inProgrammaticScroll = programmaticScroll; }
 
     void setHasSoftwareFilters(bool hasSoftwareFilters) { m_hasSoftwareFilters = hasSoftwareFilters; }
     bool hasSoftwareFilters() const { return m_hasSoftwareFilters; }
-#if ENABLE(CSS_DEVICE_ADAPTATION)
-    IntSize initialViewportSize() const { return m_initialViewportSize; }
-    void setInitialViewportSize(const IntSize& size) { m_initialViewportSize = size; }
-#endif
 
     virtual bool isActive() const OVERRIDE;
 
 #if ENABLE(RUBBER_BANDING)
     GraphicsLayer* setWantsLayerForTopOverHangArea(bool) const;
     GraphicsLayer* setWantsLayerForBottomOverHangArea(bool) const;
 #endif
 
     // DEPRECATED: Use viewportConstrainedVisibleContentRect() instead.
     IntSize scrollOffsetForFixedPosition() const;
@@ skipping 179 matching lines @@
     OwnPtr<ScrollableAreaSet> m_scrollableAreas;
     OwnPtr<ResizerAreaSet> m_resizerAreas;
     OwnPtr<ViewportConstrainedObjectSet> m_viewportConstrainedObjects;
 
     static double s_normalDeferredRepaintDelay;
     static double s_initialDeferredRepaintDelayDuringLoading;
     static double s_maxDeferredRepaintDelayDuringLoading;
     static double s_deferredRepaintDelayIncrementDuringLoading;
 
     bool m_hasSoftwareFilters;
-#if ENABLE(CSS_DEVICE_ADAPTATION)
-    // Size of viewport before any UA or author styles have overridden
-    // the viewport given by the window or viewing area of the UA.
-    IntSize m_initialViewportSize;
-#endif
 
     float m_visibleContentScaleFactor;
 };
 
 inline void FrameView::incrementVisuallyNonEmptyCharacterCount(unsigned count)
 {
     if (m_isVisuallyNonEmpty)
         return;
     m_visuallyNonEmptyCharacterCount += count;
     // Use a threshold value to prevent very small amounts of visible content from triggering didFirstVisuallyNonEmptyLayout.
@@ skipping 35 matching lines @@
     ASSERT(!widget || widget->isFrameView());
     return static_cast<const FrameView*>(widget);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toFrameView(const FrameView*);
 
 } // namespace WebCore
 
 #endif // FrameView_h