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

Source/modules/indexeddb/IDBRequestTest.cpp

 /*
  * Copyright (C) 2012 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
@@ skipping 57 matching lines @@
 
 NullExecutionContext::NullExecutionContext()
     : m_queue(adoptPtr(new NullEventQueue()))
 {
 }
 
 class IDBRequestTest : public testing::Test {
 public:
     IDBRequestTest()
         : m_scope(v8::Isolate::GetCurrent())
+        , m_executionContext(adoptRef(new NullExecutionContext()))
     {
-        m_scope.scriptState()->setExecutionContext(adoptRef(new NullExecutionContext()));
+        m_scope.scriptState()->setExecutionContext(m_executionContext.get());
+    }
+
+    ~IDBRequestTest()
+    {
+        m_scope.scriptState()->setExecutionContext(0);
     }
 
     v8::Isolate* isolate() const { return m_scope.isolate(); }
     ScriptState* scriptState() const { return m_scope.scriptState(); }
     ExecutionContext* executionContext() const { return m_scope.scriptState()->executionContext(); }
 
 private:
     V8TestingScope m_scope;
+    RefPtr<ExecutionContext> m_executionContext;
 };
 
 TEST_F(IDBRequestTest, EventsAfterStopping)
 {
     IDBTransaction* transaction = 0;
     IDBRequest* request = IDBRequest::create(scriptState(), IDBAny::createUndefined(), transaction);
     EXPECT_EQ(request->readyState(), "pending");
     executionContext()->stopActiveDOMObjects();
 
     // Ensure none of the following raise assertions in stopped state:
@@ skipping 69 matching lines @@
         OwnPtr<MockWebIDBDatabase> backend = MockWebIDBDatabase::create();
         IDBOpenDBRequest* request = IDBOpenDBRequest::create(scriptState(), callbacks, transactionId, version);
         EXPECT_EQ(request->readyState(), "pending");
 
         executionContext()->stopActiveDOMObjects();
         request->onSuccess(backend.release(), metadata);
     }
 }
 
 } // namespace