Reduce StyleRule class size by eliminating padding in the layout.

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

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2005, 2006, 2008, 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 193 matching lines @@
 }
 
 unsigned StyleRule::AverageSizeInBytes() {
   return sizeof(StyleRule) + sizeof(CSSSelector) +
          StylePropertySet::AverageSizeInBytes();
 }
 
 StyleRule::StyleRule(CSSSelectorList selector_list,
                      StylePropertySet* properties)
     : StyleRuleBase(kStyle),
+      should_consider_for_matching_rules_(kConsiderIfNonEmpty),
       selector_list_(std::move(selector_list)),
-      properties_(properties),
-      should_consider_for_matching_rules_(kConsiderIfNonEmpty) {}
+      properties_(properties) {}
 
 StyleRule::StyleRule(CSSSelectorList selector_list,
                      CSSLazyPropertyParser* lazy_property_parser)
     : StyleRuleBase(kStyle),
+      should_consider_for_matching_rules_(kAlwaysConsider),
       selector_list_(std::move(selector_list)),
-      lazy_property_parser_(lazy_property_parser),
-      should_consider_for_matching_rules_(kAlwaysConsider) {}
+      lazy_property_parser_(lazy_property_parser) {}
 
 const StylePropertySet& StyleRule::Properties() const {
   if (!properties_) {
     properties_ = lazy_property_parser_->ParseProperties();
     lazy_property_parser_.Clear();
   }
   return *properties_;
 }
 
 StyleRule::StyleRule(const StyleRule& o)
     : StyleRuleBase(o),
+      should_consider_for_matching_rules_(kConsiderIfNonEmpty),
       selector_list_(o.selector_list_.Copy()),
-      properties_(o.Properties().MutableCopy()),
-      should_consider_for_matching_rules_(kConsiderIfNonEmpty) {}
+      properties_(o.Properties().MutableCopy()) {}
 
 StyleRule::~StyleRule() {}
 
 MutableStylePropertySet& StyleRule::MutableProperties() {
   // Ensure properties_ is initialized.
   if (!Properties().IsMutable())
     properties_ = properties_->MutableCopy();
   return *ToMutableStylePropertySet(properties_.Get());
 }
 
@@ skipping 145 matching lines @@
     properties_ = properties_->MutableCopy();
   return *ToMutableStylePropertySet(properties_);
 }
 
 DEFINE_TRACE_AFTER_DISPATCH(StyleRuleViewport) {
   visitor->Trace(properties_);
   StyleRuleBase::TraceAfterDispatch(visitor);
 }
 
 }  // namespace blink