Remove almost all clients of isHTMLElement

sky/engine/core/editing/EditingStyle.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 86 matching lines @@
 
     MutableStylePropertySet* style() { return m_mutableStyle.get(); }
 
     bool isEmpty() const;
 
     void clear();
     PassRefPtr<EditingStyle> copy() const;
 
     void removeBlockProperties();
 
-    static bool elementIsStyledSpanOrHTMLEquivalent(const HTMLElement*);
+    static bool elementIsStyledSpanOrHTMLEquivalent(const Element*);
 
     void mergeTypingStyle(Document*);
 
 private:
     EditingStyle();
     EditingStyle(ContainerNode*, PropertiesToInclude);
     EditingStyle(const Position&, PropertiesToInclude);
     explicit EditingStyle(const StylePropertySet*);
     EditingStyle(CSSPropertyID, const String& value);
     void init(Node*, PropertiesToInclude);
     void removeTextFillAndStrokeColorsIfNeeded(RenderStyle*);
     void setProperty(CSSPropertyID, const String& value);
     void replaceFontSizeByKeywordIfPossible(RenderStyle*, CSSComputedStyleDeclaration*);
     void extractFontSizeDelta();
 
     enum CSSPropertyOverrideMode { OverrideValues, DoNotOverrideValues };
     void mergeStyle(const StylePropertySet*, CSSPropertyOverrideMode);
 
     RefPtr<MutableStylePropertySet> m_mutableStyle;
     FixedPitchFontType m_fixedPitchFontType;
     float m_fontSizeDelta;
 
     friend class HTMLElementEquivalent;
     friend class HTMLAttributeEquivalent;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_EDITING_EDITINGSTYLE_H_