[bindings] Refactor ScriptStateForTesting, V8TestingScope into V8BindingForTesting.h/cpp

Source/bindings/core/v8/ScriptState.cpp

Index: Source/bindings/core/v8/ScriptState.cpp
diff --git a/Source/bindings/core/v8/ScriptState.cpp b/Source/bindings/core/v8/ScriptState.cpp
index 106c37e1a04efd1871c4ec8c479fa92ee274d307..3de3de91fab7a2c8e7ef9fec6e6060c9cfb634aa 100644
--- a/Source/bindings/core/v8/ScriptState.cpp
+++ b/Source/bindings/core/v8/ScriptState.cpp
@@ -116,28 +116,4 @@ ScriptState* ScriptState::forMainWorld(LocalFrame* frame)
     return ScriptState::from(toV8Context(frame, DOMWrapperWorld::mainWorld()));
 }
 
-PassRefPtr<ScriptStateForTesting> ScriptStateForTesting::create(v8::Handle<v8::Context> context, PassRefPtr<DOMWrapperWorld> world)
-{
-    RefPtr<ScriptStateForTesting> scriptState = adoptRef(new ScriptStateForTesting(context, world));
-    // This ref() is for keeping this ScriptState alive as long as the v8::Context is alive.
-    // This is deref()ed in the weak callback of the v8::Context.
-    scriptState->ref();
-    return scriptState;
-}
-
-ScriptStateForTesting::ScriptStateForTesting(v8::Handle<v8::Context> context, PassRefPtr<DOMWrapperWorld> world)
-    : ScriptState(context, world)
-{
-}
-
-ExecutionContext* ScriptStateForTesting::executionContext() const
-{
-    return m_executionContext;
-}
-
-void ScriptStateForTesting::setExecutionContext(ExecutionContext* executionContext)
-{
-    m_executionContext = executionContext;
-}
-
 }