Don't generate RuleSets for viewport UA sheets.

third_party/WebKit/Source/core/css/CSSDefaultStyleSheets.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc.
  * All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * 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.
@@ skipping 29 matching lines @@
   static CSSDefaultStyleSheets& instance();
 
   void ensureDefaultStyleSheetsForElement(const Element&,
                                           bool& changedDefaultStyle);
   void ensureDefaultStyleSheetForFullscreen();
 
   RuleSet* defaultStyle() { return m_defaultStyle.get(); }
   RuleSet* defaultQuirksStyle() { return m_defaultQuirksStyle.get(); }
   RuleSet* defaultPrintStyle() { return m_defaultPrintStyle.get(); }
   RuleSet* defaultViewSourceStyle();
-  RuleSet* defaultMobileViewportStyle();
-  RuleSet* defaultTelevisionViewportStyle();
 
-  // FIXME: Remove WAP support.
-  RuleSet* defaultXHTMLMobileProfileStyle();
+  StyleSheetContents* ensureMobileViewportStyleSheet();
+  StyleSheetContents* ensureTelevisionViewportStyleSheet();
+  StyleSheetContents* ensureXHTMLMobileProfileStyleSheet();
 
   StyleSheetContents* defaultStyleSheet() { return m_defaultStyleSheet.get(); }
   StyleSheetContents* quirksStyleSheet() { return m_quirksStyleSheet.get(); }
   StyleSheetContents* svgStyleSheet() { return m_svgStyleSheet.get(); }
   StyleSheetContents* mathmlStyleSheet() { return m_mathmlStyleSheet.get(); }
   StyleSheetContents* mediaControlsStyleSheet() {
     return m_mediaControlsStyleSheet.get();
   }
   StyleSheetContents* fullscreenStyleSheet() {
     return m_fullscreenStyleSheet.get();
   }
 
   DECLARE_TRACE();
 
  private:
   CSSDefaultStyleSheets();
 
   Member<RuleSet> m_defaultStyle;
-  Member<RuleSet> m_defaultMobileViewportStyle;
-  Member<RuleSet> m_defaultTelevisionViewportStyle;
   Member<RuleSet> m_defaultQuirksStyle;
   Member<RuleSet> m_defaultPrintStyle;
   Member<RuleSet> m_defaultViewSourceStyle;
-  Member<RuleSet> m_defaultXHTMLMobileProfileStyle;
 
   Member<StyleSheetContents> m_defaultStyleSheet;
   Member<StyleSheetContents> m_mobileViewportStyleSheet;
   Member<StyleSheetContents> m_televisionViewportStyleSheet;
+  Member<StyleSheetContents> m_xhtmlMobileProfileStyleSheet;
   Member<StyleSheetContents> m_quirksStyleSheet;
   Member<StyleSheetContents> m_svgStyleSheet;
   Member<StyleSheetContents> m_mathmlStyleSheet;
   Member<StyleSheetContents> m_mediaControlsStyleSheet;
   Member<StyleSheetContents> m_fullscreenStyleSheet;
 };
 
 }  // namespace blink
 
 #endif  // CSSDefaultStyleSheets_h