Fix test failures of IDBTransactionTest.EnsureLifetime with ENABLE(OILPAN)

Source/bindings/v8/ScriptState.h

Index: Source/bindings/v8/ScriptState.h
diff --git a/Source/bindings/v8/ScriptState.h b/Source/bindings/v8/ScriptState.h
index 1387b299dff03a6b3971902e863b0546dabd6f67..621585fce7782f49a0ae026b1e34219adb123b4e 100644
--- a/Source/bindings/v8/ScriptState.h
+++ b/Source/bindings/v8/ScriptState.h
@@ -70,7 +70,7 @@ public:
     DOMWrapperWorld& world() const { return *m_world; }
     DOMWindow* domWindow() const;
     virtual ExecutionContext* executionContext() const;
-    virtual void setExecutionContext(PassRefPtr<ExecutionContext>);
+    virtual void setExecutionContext(ExecutionContext*);
 
     // This can return an empty handle if the v8::Context is gone.
     v8::Handle<v8::Context> context() const { return m_context.newLocal(m_isolate); }
@@ -107,12 +107,12 @@ public:
     static PassRefPtr<ScriptStateForTesting> create(v8::Handle<v8::Context>, PassRefPtr<DOMWrapperWorld>);
 
     virtual ExecutionContext* executionContext() const OVERRIDE;
-    virtual void setExecutionContext(PassRefPtr<ExecutionContext>) OVERRIDE;
+    virtual void setExecutionContext(ExecutionContext*) OVERRIDE;
 
 private:
     ScriptStateForTesting(v8::Handle<v8::Context>, PassRefPtr<DOMWrapperWorld>);
 
-    RefPtr<ExecutionContext> m_executionContext;
+    ExecutionContext* m_executionContext;
 };
 
 // ScriptStateProtectingContext keeps the context associated with the ScriptState alive.