On Document disposal, only dispose of script runner.

third_party/WebKit/Source/core/dom/ScriptRunner.h

Index: third_party/WebKit/Source/core/dom/ScriptRunner.h
diff --git a/third_party/WebKit/Source/core/dom/ScriptRunner.h b/third_party/WebKit/Source/core/dom/ScriptRunner.h
index 5a3d66d1c358cd08c12d0f1d2111cef57188b721..f39b73d9aec799b089d3ab78c2798e242b0547cd 100644
--- a/third_party/WebKit/Source/core/dom/ScriptRunner.h
+++ b/third_party/WebKit/Source/core/dom/ScriptRunner.h
@@ -48,6 +48,9 @@ public:
         return adoptPtrWillBeNoop(new ScriptRunner(document));
     }
     ~ScriptRunner();
+#if !ENABLE(OILPAN)
+    void dispose();
+#endif
 
     enum ExecutionType { ASYNC_EXECUTION, IN_ORDER_EXECUTION };
     void queueScriptForExecution(ScriptLoader*, ExecutionType);
@@ -82,6 +85,6 @@ private:
     OwnPtr<CancellableTaskFactory> m_executeScriptsTaskFactory;
 };
 
-}
+} // namespace blink
 
-#endif
+#endif // ScriptRunner_h