Reduce StyleRule class size by eliminating padding in the layout.

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

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2006, 2008, 2012, 2013 Apple 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 114 matching lines @@
   DECLARE_TRACE_AFTER_DISPATCH();
 
  private:
   friend class CSSLazyParsingTest;
   bool HasParsedProperties() const;
 
   StyleRule(CSSSelectorList, StylePropertySet*);
   StyleRule(CSSSelectorList, CSSLazyPropertyParser*);
   StyleRule(const StyleRule&);
 
-  CSSSelectorList selector_list_;
-  mutable Member<StylePropertySet> properties_;
-  mutable Member<CSSLazyPropertyParser> lazy_property_parser_;
-
   // Whether or not we should consider this for matching rules. Usually we try
   // to avoid considering empty property sets, as an optimization. This is
   // not possible for lazy properties, which always need to be considered. The
   // lazy parser does its best to avoid lazy parsing for properties that look
   // empty due to lack of tokens.
   enum ConsiderForMatching {
     kAlwaysConsider,
     kConsiderIfNonEmpty,
   };
   mutable ConsiderForMatching should_consider_for_matching_rules_;
+
+  CSSSelectorList selector_list_;
+  mutable Member<StylePropertySet> properties_;
+  mutable Member<CSSLazyPropertyParser> lazy_property_parser_;
 };
 
 class StyleRuleFontFace : public StyleRuleBase {
  public:
   static StyleRuleFontFace* Create(StylePropertySet* properties) {
     return new StyleRuleFontFace(properties);
   }
 
   ~StyleRuleFontFace();
 
@@ skipping 172 matching lines @@
 DEFINE_STYLE_RULE_TYPE_CASTS(FontFace);
 DEFINE_STYLE_RULE_TYPE_CASTS(Page);
 DEFINE_STYLE_RULE_TYPE_CASTS(Media);
 DEFINE_STYLE_RULE_TYPE_CASTS(Supports);
 DEFINE_STYLE_RULE_TYPE_CASTS(Viewport);
 DEFINE_STYLE_RULE_TYPE_CASTS(Charset);
 
 }  // namespace blink
 
 #endif  // StyleRule_h