Oilpan: have PendingScripts trace their script elements.

Source/core/html/parser/HTMLScriptRunnerHost.h

 /*
  * Copyright (C) 2010 Google, Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 12 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef HTMLScriptRunnerHost_h
 #define HTMLScriptRunnerHost_h
 
 #include "wtf/Forward.h"
 
 namespace WebCore {
 
+class HTMLInputStream;
 class Resource;
-class Element;
-class HTMLInputStream;
-class ScriptSourceCode;
+class Visitor;
 
-class HTMLScriptRunnerHost {
+class HTMLScriptRunnerHost : public WillBeGarbageCollectedMixin {
 public:
     virtual ~HTMLScriptRunnerHost() { }
+    virtual void trace(Visitor*) { }
 
-    // Implementors should call cachedResource->addClient() here or soon after.
-    virtual void watchForLoad(Resource*) = 0;
-    // Implementors must call cachedResource->removeClient() immediately.
-    virtual void stopWatchingForLoad(Resource*) = 0;
-
+    virtual void notifyScriptLoaded(Resource*) = 0;
     virtual HTMLInputStream& inputStream() = 0;
 
     virtual bool hasPreloadScanner() const = 0;
     virtual void appendCurrentInputStreamToPreloadScannerAndScan() = 0;
 
 };
 
 }
 
 #endif