Make ActiveScriptWrappable the GC mixin it is.

third_party/WebKit/Source/bindings/core/v8/ActiveScriptWrappable.h

Index: third_party/WebKit/Source/bindings/core/v8/ActiveScriptWrappable.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/ActiveScriptWrappable.h b/third_party/WebKit/Source/bindings/core/v8/ActiveScriptWrappable.h
index d5804194b83f5cf8f4401829bd718b70c97d6264..74ffa730af6e31d1f74e49a0e899ed9c7b577149 100644
--- a/third_party/WebKit/Source/bindings/core/v8/ActiveScriptWrappable.h
+++ b/third_party/WebKit/Source/bindings/core/v8/ActiveScriptWrappable.h
@@ -6,6 +6,7 @@
 #define ActiveScriptWrappable_h
 
 #include "core/CoreExport.h"
+#include "platform/heap/Handle.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
@@ -18,7 +19,7 @@ class ScriptWrappableVisitor;
  * thread-specific list. They keep their wrappers and dependant objects alive
  * as long as they have pending activity.
  */
-class CORE_EXPORT ActiveScriptWrappable {
+class CORE_EXPORT ActiveScriptWrappable : public GarbageCollectedMixin {
     WTF_MAKE_NONCOPYABLE(ActiveScriptWrappable);
 public:
     explicit ActiveScriptWrappable(ScriptWrappable*);
@@ -29,9 +30,6 @@ public:
 
     ScriptWrappable* toScriptWrappable() const;
 
-protected:
-    virtual ~ActiveScriptWrappable();
-
 private:
     ScriptWrappable* m_scriptWrappable;
 };