Change various helper classes to transition types to get CSSValue entirely onto the gc heap.

Source/core/css/MediaQueryEvaluator.cpp

Index: Source/core/css/MediaQueryEvaluator.cpp
diff --git a/Source/core/css/MediaQueryEvaluator.cpp b/Source/core/css/MediaQueryEvaluator.cpp
index 47718ceb360a770df428bc14f5672b98f4caf764..e6602b5c17ba55aef2be96bf5c44222728c63274 100644
--- a/Source/core/css/MediaQueryEvaluator.cpp
+++ b/Source/core/css/MediaQueryEvaluator.cpp
@@ -123,7 +123,7 @@ bool MediaQueryEvaluator::eval(const MediaQuerySet* querySet, MediaQueryResultLi
     if (!querySet)
         return true;
 
-    const Vector<OwnPtr<MediaQuery> >& queries = querySet->queryVector();
+    const WillBeHeapVector<OwnPtrWillBeMember<MediaQuery> >& queries = querySet->queryVector();
     if (!queries.size())
         return true; // Empty query list evaluates to true.
 
@@ -133,13 +133,13 @@ bool MediaQueryEvaluator::eval(const MediaQuerySet* querySet, MediaQueryResultLi
         MediaQuery* query = queries[i].get();
 
         if (mediaTypeMatch(query->mediaType())) {
-            const ExpressionVector& expressions = query->expressions();
+            const ExpressionHeapVector& expressions = query->expressions();
             // Iterate through expressions, stop if any of them eval to false (AND semantics).
             size_t j = 0;
             for (; j < expressions.size(); ++j) {
                 bool exprResult = eval(expressions.at(j).get());
                 if (viewportDependentMediaQueryResults && expressions.at(j)->isViewportDependent())
-                    viewportDependentMediaQueryResults->append(adoptRef(new MediaQueryResult(*expressions.at(j), exprResult)));
+                    viewportDependentMediaQueryResults->append(adoptRefWillBeNoop(new MediaQueryResult(*expressions.at(j), exprResult)));
                 if (!exprResult)
                     break;
             }