Enabled using viewport on desktop browsers behind experimental flag

Source/core/platform/ScrollView.h

Index: Source/core/platform/ScrollView.h
diff --git a/Source/core/platform/ScrollView.h b/Source/core/platform/ScrollView.h
index fff4633722544e11bd8a15a1b7aac15395dcc572..21e468567a209093acb929305912fb250314d224 100644
--- a/Source/core/platform/ScrollView.h
+++ b/Source/core/platform/ScrollView.h
@@ -135,13 +135,9 @@ public:
 
     // Functions for getting/setting the size webkit should use to layout the contents. By default this is the same as the visible
     // content size. Explicitly setting a layout size value will cause webkit to layout the contents using this size instead.
-    IntSize layoutSize(VisibleContentRectIncludesScrollbars = ExcludeScrollbars) const;
+    virtual IntSize layoutSize(VisibleContentRectIncludesScrollbars = ExcludeScrollbars) const;
     int layoutWidth(VisibleContentRectIncludesScrollbars scrollbarInclusion = ExcludeScrollbars) const { return layoutSize(scrollbarInclusion).width(); }
     int layoutHeight(VisibleContentRectIncludesScrollbars scrollbarInclusion = ExcludeScrollbars) const { return layoutSize(scrollbarInclusion).height(); }
-    IntSize fixedLayoutSize() const;
-    void setFixedLayoutSize(const IntSize&);
-    bool useFixedLayout() const;
-    void setUseFixedLayout(bool enable);
 
     // Functions for getting/setting the size of the document contained inside the ScrollView (as an IntSize or as individual width and height
     // values).
@@ -318,7 +314,6 @@ private:
 
     IntSize m_scrollOffset; // FIXME: Would rather store this as a position, but we will wait to make this change until more code is shared.
     IntPoint m_cachedScrollPosition;
-    IntSize m_fixedLayoutSize;
     IntSize m_contentsSize;
 
     int m_scrollbarsAvoidingResizer;