Update more core classes to use OVERRIDE / FINAL when needed

Source/core/rendering/RenderBox.h

Index: Source/core/rendering/RenderBox.h
diff --git a/Source/core/rendering/RenderBox.h b/Source/core/rendering/RenderBox.h
index 65f1445e4dd2bbb2daa845e249528422196838eb..01d892fd573280d35bbc9b521fa977c4015eace1 100644
--- a/Source/core/rendering/RenderBox.h
+++ b/Source/core/rendering/RenderBox.h
@@ -402,7 +402,7 @@ public:
     void repaintDuringLayoutIfMoved(const LayoutRect&);
     virtual void repaintOverhangingFloats(bool paintAllDescendants);
 
-    virtual LayoutUnit containingBlockLogicalWidthForContent() const;
+    virtual LayoutUnit containingBlockLogicalWidthForContent() const OVERRIDE;
     LayoutUnit containingBlockLogicalHeightForContent(AvailableLogicalHeightType) const;
 
     LayoutUnit containingBlockLogicalWidthForContentInRegion(RenderRegion*) const;
@@ -537,7 +537,7 @@ public:
     bool isDeprecatedFlexItem() const { return !isInline() && !isFloatingOrOutOfFlowPositioned() && parent() && parent()->isDeprecatedFlexibleBox(); }
     bool isFlexItemIncludingDeprecated() const { return !isInline() && !isFloatingOrOutOfFlowPositioned() && parent() && parent()->isFlexibleBoxIncludingDeprecated(); }
 
-    virtual LayoutUnit lineHeight(bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const;
+    virtual LayoutUnit lineHeight(bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const OVERRIDE;
     virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const OVERRIDE;
 
     virtual LayoutUnit offsetLeft() const OVERRIDE;