Merge StyleSheet into CSSStyleSheet.

sky/engine/core/dom/StyleSheetCandidate.cpp

 /*
  * 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 18 matching lines @@
 
 #include "sky/engine/core/dom/Element.h"
 #include "sky/engine/core/dom/StyleEngine.h"
 #include "sky/engine/core/html/HTMLStyleElement.h"
 #include "sky/engine/core/html/imports/HTMLImport.h"
 
 namespace blink {
 
 bool StyleSheetCandidate::canBeActivated() const
 {
-    StyleSheet* sheet = this->sheet();
-    return sheet && sheet->isCSSStyleSheet();
+    // TODO(esprehn): Remove this.
+    CSSStyleSheet* sheet = this->sheet();
+    return sheet;
 }
 
 StyleSheetCandidate::Type StyleSheetCandidate::typeOf(Node& node)
 {
     if (node.isHTMLElement()) {
         if (isHTMLStyleElement(node))
             return HTMLStyle;
 
         ASSERT_NOT_REACHED();
         return HTMLStyle;
     }
 
     ASSERT_NOT_REACHED();
     return HTMLStyle;
 }
 
-StyleSheet* StyleSheetCandidate::sheet() const
+CSSStyleSheet* StyleSheetCandidate::sheet() const
 {
     switch (m_type) {
     case HTMLStyle:
         return toHTMLStyleElement(node()).sheet();
     }
 
     ASSERT_NOT_REACHED();
     return 0;
 }
 
 }