Reduce CSSStyleSheet size by moving bool member.

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

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2008, 2009, 2010, 2012 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 134 matching lines @@
   bool isCSSStyleSheet() const override { return true; }
   String type() const override { return "text/css"; }
 
   void reattachChildRuleCSSOMWrappers();
 
   bool canAccessRules() const;
 
   void setLoadCompleted(bool);
 
   Member<StyleSheetContents> m_contents;
-  bool m_isInlineStylesheet;
-  bool m_isDisabled;
+  bool m_isInlineStylesheet = false;
+  bool m_isDisabled = false;
+  bool m_loadCompleted = false;
   String m_title;
   Member<MediaQuerySet> m_mediaQueries;
 
   RefPtr<SecurityOrigin> m_allowRuleAccessFromOrigin;
 
   Member<Node> m_ownerNode;
   Member<CSSRule> m_ownerRule;
 
   TextPosition m_startPosition;
-  bool m_loadCompleted;
   mutable Member<MediaList> m_mediaCSSOMWrapper;
   mutable HeapVector<Member<CSSRule>> m_childRuleCSSOMWrappers;
   mutable Member<CSSRuleList> m_ruleListCSSOMWrapper;
 };
 
 inline CSSStyleSheet::RuleMutationScope::RuleMutationScope(CSSStyleSheet* sheet)
     : m_styleSheet(sheet) {
   if (m_styleSheet)
     m_styleSheet->willMutateRules();
 }
 
 inline CSSStyleSheet::RuleMutationScope::RuleMutationScope(CSSRule* rule)
-    : m_styleSheet(rule ? rule->parentStyleSheet() : 0) {
+    : m_styleSheet(rule ? rule->parentStyleSheet() : nullptr) {
   if (m_styleSheet)
     m_styleSheet->willMutateRules();
 }
 
 inline CSSStyleSheet::RuleMutationScope::~RuleMutationScope() {
   if (m_styleSheet)
     m_styleSheet->didMutateRules();
 }
 
 DEFINE_TYPE_CASTS(CSSStyleSheet,
                   StyleSheet,
                   sheet,
                   sheet->isCSSStyleSheet(),
                   sheet.isCSSStyleSheet());
 
 }  // namespace blink
 
 #endif