Consistently use on-heap collections for StyleRuleBase descendants.

Source/core/css/resolver/ViewportStyleResolver.cpp

 /*
  * Copyright (C) 2012-2013 Intel Corporation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer.
@@ skipping 39 matching lines @@
 }
 
 ViewportStyleResolver::~ViewportStyleResolver()
 {
 }
 
 void ViewportStyleResolver::collectViewportRules(RuleSet* rules, Origin origin)
 {
     rules->compactRulesIfNeeded();
 
-    const Vector<StyleRuleViewport*>& viewportRules = rules->viewportRules();
+    const WillBeHeapVector<RawPtrWillBeMember<StyleRuleViewport> >& viewportRules = rules->viewportRules();
     for (size_t i = 0; i < viewportRules.size(); ++i)
         addViewportRule(viewportRules[i], origin);
 }
 
 void ViewportStyleResolver::addViewportRule(StyleRuleViewport* viewportRule, Origin origin)
 {
     StylePropertySet* propertySet = viewportRule->mutableProperties();
 
     unsigned propertyCount = propertySet->propertyCount();
     if (!propertyCount)
@@ skipping 129 matching lines @@
 
     Length result = primitiveValue->convertToLength<AnyConversion>(CSSToLengthConversionData(documentStyle, documentStyle, width, height, 1.0f));
     if (documentStyle->hasViewportUnits())
         m_document->setHasViewportUnits();
     documentStyle->setHasViewportUnits(documentStyleHasViewportUnits);
 
     return result;
 }
 
 } // namespace WebCore