Make MediaQueryList an ActiveDOMElement

Source/core/css/MediaQueryList.h

Index: Source/core/css/MediaQueryList.h
diff --git a/Source/core/css/MediaQueryList.h b/Source/core/css/MediaQueryList.h
index 903467ac210d9a6658005298e95a9351415ef05b..52c73ef0a7ec4f39b30c8a495257824be1a3d9cb 100644
--- a/Source/core/css/MediaQueryList.h
+++ b/Source/core/css/MediaQueryList.h
@@ -20,6 +20,7 @@
 #ifndef MediaQueryList_h
 #define MediaQueryList_h
 
+#include "core/dom/ActiveDOMObject.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
 #include "wtf/RefCounted.h"
@@ -27,6 +28,7 @@
 
 namespace blink {
 
+class ExecutionContext;
 class MediaQueryListListener;
 class MediaQueryEvaluator;
 class MediaQueryMatcher;
@@ -37,9 +39,9 @@ class MediaQuerySet;
 // retrieve the current value of the given media query and to add/remove listeners that
 // will be called whenever the value of the query changes.
 
-class MediaQueryList FINAL : public RefCountedWillBeGarbageCollectedFinalized<MediaQueryList> {
+class MediaQueryList FINAL : public RefCountedWillBeGarbageCollectedFinalized<MediaQueryList>, public ActiveDOMObject {
 public:
-    static PassRefPtrWillBeRawPtr<MediaQueryList> create(PassRefPtrWillBeRawPtr<MediaQueryMatcher>, PassRefPtrWillBeRawPtr<MediaQuerySet>);
+    static PassRefPtrWillBeRawPtr<MediaQueryList> create(ExecutionContext*, PassRefPtrWillBeRawPtr<MediaQueryMatcher>, PassRefPtrWillBeRawPtr<MediaQuerySet>);
     virtual ~MediaQueryList();
 
     String media() const;
@@ -52,10 +54,12 @@ public:
 
     void trace(Visitor*);
 
-    void documentDetached();
+    // From ActiveDOMObject
+    virtual bool hasPendingActivity() const OVERRIDE;
+    virtual void stop() OVERRIDE;
 
 private:
-    MediaQueryList(PassRefPtrWillBeRawPtr<MediaQueryMatcher>, PassRefPtrWillBeRawPtr<MediaQuerySet>);
+    MediaQueryList(ExecutionContext*, PassRefPtrWillBeRawPtr<MediaQueryMatcher>, PassRefPtrWillBeRawPtr<MediaQuerySet>);
 
     bool updateMatches();