Make RenderObject::style() return a const object

Source/core/rendering/RenderView.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 41 matching lines @@
 
     // Returns the total count of calls to HitTest, for testing.
     unsigned hitTestCount() const { return m_hitTestCount; }
 
     virtual const char* renderName() const override { return "RenderView"; }
 
     virtual bool isOfType(RenderObjectType type) const override { return type == RenderObjectRenderView || RenderBlockFlow::isOfType(type); }
 
     virtual LayerType layerTypeRequired() const override { return NormalLayer; }
 
-    virtual bool isChildAllowed(RenderObject*, RenderStyle*) const override;
+    virtual bool isChildAllowed(RenderObject*, const RenderStyle*) const override;
 
     virtual void layout() override;
     virtual void updateLogicalWidth() override;
     virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const override;
 
     virtual LayoutUnit availableLogicalHeight(AvailableLogicalHeightType) const override;
 
     // The same as the FrameView's layoutHeight/layoutWidth but with null check guards.
     int viewHeight(IncludeScrollbarsInRect = ExcludeScrollbars) const;
     int viewWidth(IncludeScrollbarsInRect = ExcludeScrollbars) const;
@@ skipping 178 matching lines @@
             m_paintInvalidationState->m_cachedOffsetsEnabled = true;
     }
 private:
     const PaintInvalidationState* m_paintInvalidationState;
     bool m_didDisable;
 };
 
 } // namespace blink
 
 #endif // RenderView_h