Ensure DOMWrapperWorld always exists in all webkit_unit_tests

Source/bindings/v8/IDBBindingUtilitiesTest.cpp

Index: Source/bindings/v8/IDBBindingUtilitiesTest.cpp
diff --git a/Source/bindings/v8/IDBBindingUtilitiesTest.cpp b/Source/bindings/v8/IDBBindingUtilitiesTest.cpp
index b9a00c246cb41508fc4ee9c39fddd6dcfbaa925e..7fd5bda1c58d0e61fd9d7861dd805194a847f5ac 100644
--- a/Source/bindings/v8/IDBBindingUtilitiesTest.cpp
+++ b/Source/bindings/v8/IDBBindingUtilitiesTest.cpp
@@ -93,14 +93,11 @@ void checkKeyPathNumberValue(const ScriptValue& value, const String& keyPath, in
 class IDBKeyFromValueAndKeyPathTest : public testing::Test {
 public:
     IDBKeyFromValueAndKeyPathTest()
-        : m_handleScope(v8::Isolate::GetCurrent())
-        , m_scope(v8::Context::New(v8::Isolate::GetCurrent()))
+        : m_scope(V8BindingTestScope::create(v8::Isolate::GetCurrent()))
     {
     }
-
 private:
-    v8::HandleScope m_handleScope;
-    v8::Context::Scope m_scope;
+    OwnPtr<V8BindingTestScope> m_scope;
 };
 
 TEST_F(IDBKeyFromValueAndKeyPathTest, TopLevelPropertyStringValue)