Oilpan: have PendingScripts trace their script elements.

Source/core/html/parser/HTMLScriptRunner.h

Index: Source/core/html/parser/HTMLScriptRunner.h
diff --git a/Source/core/html/parser/HTMLScriptRunner.h b/Source/core/html/parser/HTMLScriptRunner.h
index e193f95facd8b6ec1aeb5349da56213151b44857..5c961bc35b7af67b3fd3e3f4d8e10640976e2855 100644
--- a/Source/core/html/parser/HTMLScriptRunner.h
+++ b/Source/core/html/parser/HTMLScriptRunner.h
@@ -27,6 +27,7 @@
 #define HTMLScriptRunner_h
 
 #include "core/dom/PendingScript.h"
+#include "platform/heap/Handle.h"
 #include "wtf/Deque.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/text/TextPosition.h"
@@ -41,7 +42,7 @@ class LocalFrame;
 class HTMLScriptRunnerHost;
 class ScriptSourceCode;
 
-class HTMLScriptRunner {
+class HTMLScriptRunner FINAL {
     WTF_MAKE_NONCOPYABLE(HTMLScriptRunner); WTF_MAKE_FAST_ALLOCATED;
 public:
     static PassOwnPtr<HTMLScriptRunner> create(Document* document, HTMLScriptRunnerHost* host)
@@ -53,7 +54,7 @@ public:
     void detach();
 
     // Processes the passed in script and any pending scripts if possible.
-    void execute(PassRefPtr<Element> scriptToProcess, const TextPosition& scriptStartPosition);
+    void execute(PassRefPtrWillBeRawPtr<Element> scriptToProcess, const TextPosition& scriptStartPosition);
 
     void executeScriptsWaitingForLoad(Resource*);
     bool hasScriptsWaitingForResources() const { return m_hasScriptsWaitingForResources; }
@@ -63,6 +64,8 @@ public:
     bool hasParserBlockingScript() const;
     bool isExecutingScript() const { return !!m_scriptNestingLevel; }
 
+    void trace(Visitor*);
+
 private:
     HTMLScriptRunner(Document*, HTMLScriptRunnerHost*);