Move MediaQuery classes off BlinkGC heap

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

Index: third_party/WebKit/Source/core/css/StyleRuleImport.cpp
diff --git a/third_party/WebKit/Source/core/css/StyleRuleImport.cpp b/third_party/WebKit/Source/core/css/StyleRuleImport.cpp
index 4a05f29261200a9dae8605cea2a336665a2e9085..343bf9221e08969187d6c5498966989a37c9eeeb 100644
--- a/third_party/WebKit/Source/core/css/StyleRuleImport.cpp
+++ b/third_party/WebKit/Source/core/css/StyleRuleImport.cpp
@@ -32,11 +32,12 @@
 namespace blink {
 
 StyleRuleImport* StyleRuleImport::create(const String& href,
-                                         MediaQuerySet* media) {
+                                         RefPtr<MediaQuerySet> media) {
   return new StyleRuleImport(href, media);
 }
 
-StyleRuleImport::StyleRuleImport(const String& href, MediaQuerySet* media)
+StyleRuleImport::StyleRuleImport(const String& href,
+                                 RefPtr<MediaQuerySet> media)
     : StyleRuleBase(Import),
       m_parentStyleSheet(nullptr),
       m_styleSheetClient(new ImportedStyleSheetClient(this)),
@@ -58,7 +59,6 @@ void StyleRuleImport::dispose() {
 DEFINE_TRACE_AFTER_DISPATCH(StyleRuleImport) {
   visitor->trace(m_styleSheetClient);
   visitor->trace(m_parentStyleSheet);
-  visitor->trace(m_mediaQueries);
   visitor->trace(m_styleSheet);
   visitor->trace(m_resource);
   StyleRuleBase::traceAfterDispatch(visitor);