Replace FINAL and OVERRIDE with their C++11 counterparts in Source/core/[css|rendering|clipboard]

Source/core/rendering/RenderSelectionInfo.h

Index: Source/core/rendering/RenderSelectionInfo.h
diff --git a/Source/core/rendering/RenderSelectionInfo.h b/Source/core/rendering/RenderSelectionInfo.h
index e6f12cf79392034ea7d0173f8f0751fb057efe03..6d7803002cccd2702760cd71f0758ecbd3498f97 100644
--- a/Source/core/rendering/RenderSelectionInfo.h
+++ b/Source/core/rendering/RenderSelectionInfo.h
@@ -55,7 +55,7 @@ protected:
 };
 
 // This struct is used when the selection changes to cache the old and new state of the selection for each RenderObject.
-class RenderSelectionInfo FINAL : public RenderSelectionInfoBase {
+class RenderSelectionInfo final : public RenderSelectionInfoBase {
 public:
     RenderSelectionInfo(RenderObject* o)
         : RenderSelectionInfoBase(o)
@@ -98,7 +98,7 @@ private:
 };
 
 // This struct is used when the selection changes to cache the old and new state of the selection for each RenderBlock.
-class RenderBlockSelectionInfo FINAL : public RenderSelectionInfoBase {
+class RenderBlockSelectionInfo final : public RenderSelectionInfoBase {
 public:
     RenderBlockSelectionInfo(RenderBlock* b)
         : RenderSelectionInfoBase(b)