Move CSSOM classes to using MutableStylePropertySet over StylePropertySet.

Source/core/editing/FrameSelection.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple 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 23 matching lines @@
 #include "core/platform/graphics/LayoutRect.h"
 #include "core/rendering/ScrollBehavior.h"
 #include <wtf/Noncopyable.h>
 
 namespace WebCore {
 
 class CharacterData;
 class Frame;
 class GraphicsContext;
 class HTMLFormElement;
+class MutableStylePropertySet;
 class RenderObject;
 class RenderView;
 class Settings;
-class StylePropertySet;
 class VisiblePosition;
 
 enum EUserTriggered { NotUserTriggered = 0, UserTriggered = 1 };
 
 enum RevealExtentOption {
     RevealExtent,
     DoNotRevealExtent
 };
 
 class CaretBase {
@@ skipping 178 matching lines @@
     bool shouldChangeSelection(const VisibleSelection&) const;
     bool shouldDeleteSelection(const VisibleSelection&) const;
     enum EndPointsAdjustmentMode { AdjustEndpointsAtBidiBoundary, DoNotAdjsutEndpoints };
     void setNonDirectionalSelectionIfNeeded(const VisibleSelection&, TextGranularity, EndPointsAdjustmentMode = DoNotAdjsutEndpoints);
     void setFocusedNodeIfNeeded();
     void notifyRendererOfSelectionChange(EUserTriggered);
 
     void paintDragCaret(GraphicsContext*, const LayoutPoint&, const LayoutRect& clipRect) const;
 
     EditingStyle* typingStyle() const;
-    PassRefPtr<StylePropertySet> copyTypingStyle() const;
+    PassRefPtr<MutableStylePropertySet> copyTypingStyle() const;
     void setTypingStyle(PassRefPtr<EditingStyle>);
     void clearTypingStyle();
 
     FloatRect bounds(bool clipToVisibleContent = true) const;
 
     void getClippedVisibleTextRectangles(Vector<FloatRect>&) const;
 
     HTMLFormElement* currentForm() const;
 
     void revealSelection(const ScrollAlignment& = ScrollAlignment::alignCenterIfNeeded, RevealExtentOption = DoNotRevealExtent);
@@ skipping 73 matching lines @@
 }
 } // namespace WebCore
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const WebCore::FrameSelection&);
 void showTree(const WebCore::FrameSelection*);
 #endif
 
 #endif // FrameSelection_h