Improve DEFINE_STATIC_LOCAL()'s handling of Blink GCed objects.

third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 123 matching lines @@
 } // namespace
 
 namespace blink {
 
 using namespace HTMLNames;
 
 ComputedStyle* StyleResolver::s_styleNotYetAvailable;
 
 static StylePropertySet* leftToRightDeclaration()
 {
-    DEFINE_STATIC_REF_WILL_BE_PERSISTENT(MutableStylePropertySet, leftToRightDecl, (MutableStylePropertySet::create(HTMLQuirksMode)));
-    if (leftToRightDecl->isEmpty())
-        leftToRightDecl->setProperty(CSSPropertyDirection, CSSValueLtr);
-    return leftToRightDecl;
+    DEFINE_STATIC_LOCAL(MutableStylePropertySet, leftToRightDecl, (MutableStylePropertySet::create(HTMLQuirksMode)));
+    if (leftToRightDecl.isEmpty())
+        leftToRightDecl.setProperty(CSSPropertyDirection, CSSValueLtr);
+    return &leftToRightDecl;
 }
 
 static StylePropertySet* rightToLeftDeclaration()
 {
-    DEFINE_STATIC_REF_WILL_BE_PERSISTENT(MutableStylePropertySet, rightToLeftDecl, (MutableStylePropertySet::create(HTMLQuirksMode)));
-    if (rightToLeftDecl->isEmpty())
-        rightToLeftDecl->setProperty(CSSPropertyDirection, CSSValueRtl);
-    return rightToLeftDecl;
+    DEFINE_STATIC_LOCAL(MutableStylePropertySet, rightToLeftDecl, (MutableStylePropertySet::create(HTMLQuirksMode)));
+    if (rightToLeftDecl.isEmpty())
+        rightToLeftDecl.setProperty(CSSPropertyDirection, CSSValueRtl);
+    return &rightToLeftDecl;
 }
 
 static void collectScopedResolversForHostedShadowTrees(const Element& element, HeapVector<Member<ScopedStyleResolver>, 8>& resolvers)
 {
     ElementShadow* shadow = element.shadow();
     if (!shadow)
         return;
 
     // Adding scoped resolver for active shadow roots for shadow host styling.
     for (ShadowRoot* shadowRoot = &shadow->youngestShadowRoot(); shadowRoot; shadowRoot = shadowRoot->olderShadowRoot()) {
@@ skipping 1570 matching lines @@
     visitor->trace(m_uncommonAttributeRuleSet);
     visitor->trace(m_watchedSelectorsRules);
     visitor->trace(m_treeBoundaryCrossingScopes);
     visitor->trace(m_styleSharingLists);
     visitor->trace(m_pendingStyleSheets);
     visitor->trace(m_document);
 #endif
 }
 
 } // namespace blink