Merge StyleSheet into CSSStyleSheet.

sky/engine/core/dom/StyleSheetCandidate.h

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 15 matching lines @@
 
 #ifndef SKY_ENGINE_CORE_DOM_STYLESHEETCANDIDATE_H_
 #define SKY_ENGINE_CORE_DOM_STYLESHEETCANDIDATE_H_
 
 #include "sky/engine/platform/heap/Handle.h"
 #include "sky/engine/wtf/text/AtomicString.h"
 #include "sky/engine/wtf/text/WTFString.h"
 
 namespace blink {
 
+class CSSStyleSheet;
 class Document;
 class Node;
-class StyleSheet;
 
 class StyleSheetCandidate {
     STACK_ALLOCATED();
 public:
     enum Type {
         HTMLStyle,
     };
 
     StyleSheetCandidate(Node& node)
         : m_node(node)
         , m_type(typeOf(node))
     { }
 
     bool canBeActivated() const;
 
-    StyleSheet* sheet() const;
+    CSSStyleSheet* sheet() const;
 
 private:
     Node& node() const { return *m_node; }
 
     static Type typeOf(Node&);
 
     RawPtr<Node> m_node;
     Type m_type;
 };
 
 }
 
 #endif  // SKY_ENGINE_CORE_DOM_STYLESHEETCANDIDATE_H_