Oilpan: Change references to MutableStylePropertySet to transition types.

Source/core/css/resolver/ViewportStyleResolver.cpp

Index: Source/core/css/resolver/ViewportStyleResolver.cpp
diff --git a/Source/core/css/resolver/ViewportStyleResolver.cpp b/Source/core/css/resolver/ViewportStyleResolver.cpp
index 372df90473444e3ce10283d051a4c33e12860654..cfc624ed703349f963d058e9ef23b792fccf162a 100644
--- a/Source/core/css/resolver/ViewportStyleResolver.cpp
+++ b/Source/core/css/resolver/ViewportStyleResolver.cpp
@@ -42,6 +42,8 @@
 
 namespace WebCore {
 
+DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(ViewportStyleResolver);
+
 ViewportStyleResolver::ViewportStyleResolver(Document* document)
     : m_document(document),
     m_hasAuthorStyle(false)
@@ -49,10 +51,6 @@ ViewportStyleResolver::ViewportStyleResolver(Document* document)
     ASSERT(m_document);
 }
 
-ViewportStyleResolver::~ViewportStyleResolver()
-{
-}
-
 void ViewportStyleResolver::collectViewportRules(RuleSet* rules, Origin origin)
 {
     rules->compactRulesIfNeeded();
@@ -206,4 +204,9 @@ Length ViewportStyleResolver::viewportLengthValue(CSSPropertyID id) const
     return result;
 }
 
+void ViewportStyleResolver::trace(Visitor* visitor)
+{
+    visitor->trace(m_propertySet);
+}
+
 } // namespace WebCore