Remove an isContextInitialized() check from ScriptController::executeScriptInIsolatedWorld

By checking scriptState->contextIsValid(), we don't need to check isContextInitialized().

BUG=677253

Review-Url: https://codereview.chromium.org/2605853002
Cr-Commit-Position: refs/heads/master@{#440841}

third_party/WebKit/Source/bindings/core/v8/ScriptController.cpp

@@ -468,10 +468,9 @@ void ScriptController::executeScriptInIsolatedWorld(
   RefPtr<DOMWrapperWorld> world =
       DOMWrapperWorld::ensureIsolatedWorld(isolate(), worldID, extensionGroup);
   WindowProxy* isolatedWorldWindowProxy = windowProxy(*world);
-  if (!isolatedWorldWindowProxy->isContextInitialized())
-    return;
-
   ScriptState* scriptState = isolatedWorldWindowProxy->getScriptState();
+  if (!scriptState->contextIsValid())
+    return;
   v8::Context::Scope scope(scriptState->context());
   v8::Local<v8::Array> resultArray = v8::Array::New(isolate(), sources.size());