Ensure DOMWrapperWorld always exists in all webkit_unit_tests

Source/bindings/v8/ScriptPromiseTest.cpp

Index: Source/bindings/v8/ScriptPromiseTest.cpp
diff --git a/Source/bindings/v8/ScriptPromiseTest.cpp b/Source/bindings/v8/ScriptPromiseTest.cpp
index 2eb97f3695a4bdd0e3f7b9b140d7017c99dce011..a33cd0eafe9c0dbb1c16bdc7807fe2e6cdabd6b1 100644
--- a/Source/bindings/v8/ScriptPromiseTest.cpp
+++ b/Source/bindings/v8/ScriptPromiseTest.cpp
@@ -47,21 +47,17 @@ class ScriptPromiseTest : public testing::Test {
 public:
     ScriptPromiseTest()
         : m_isolate(v8::Isolate::GetCurrent())
-        , m_handleScope(m_isolate)
-        , m_context(m_isolate, v8::Context::New(m_isolate))
-        , m_contextScope(m_context.newLocal(m_isolate))
     {
     }
 
     void SetUp()
     {
-        // FIXME: Create a new world and pass it to V8PerContextData.
-        m_perContextData = V8PerContextData::create(m_context.newLocal(m_isolate), 0);
+        m_scope = V8BindingTestScope::create(m_isolate);
     }
 
     void TearDown()
     {
-        m_perContextData.clear();
+        m_scope.clear();
     }
 
     V8PromiseCustom::PromiseState state(ScriptPromise promise)
@@ -71,10 +67,9 @@ public:
 
 protected:
     v8::Isolate* m_isolate;
-    v8::HandleScope m_handleScope;
-    ScopedPersistent<v8::Context> m_context;
-    v8::Context::Scope m_contextScope;
-    OwnPtr<V8PerContextData> m_perContextData;
+
+private:
+    OwnPtr<V8BindingTestScope> m_scope;
 };
 
 TEST_F(ScriptPromiseTest, castPromise)