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 0bb1e09edac1b4ba3e277345b48ffd80ecf16fe2..a236a30bb2ec934e02b35fd868021a98b82c7825 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(kImport),
       parent_style_sheet_(nullptr),
       style_sheet_client_(new ImportedStyleSheetClient(this)),
@@ -58,7 +59,6 @@ void StyleRuleImport::Dispose() {
 DEFINE_TRACE_AFTER_DISPATCH(StyleRuleImport) {
   visitor->Trace(style_sheet_client_);
   visitor->Trace(parent_style_sheet_);
-  visitor->Trace(media_queries_);
   visitor->Trace(style_sheet_);
   visitor->Trace(resource_);
   StyleRuleBase::TraceAfterDispatch(visitor);