bindings: Use Maybe version of v8::String::NewFromUtf8()

Source/web/tests/CustomEventTest.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 49 matching lines @@
         return true;
     }
 
     virtual void handleEvent(ScriptState* scriptState, Event* event)
     {
         EXPECT_EQ(event->type(), "blah");
 
         ScriptState::Scope scope(scriptState);
         v8::Handle<v8::Value> jsEvent = toV8(event, scriptState->context()->Global(), isolate());
 
-        EXPECT_EQ(jsEvent->ToObject(isolate())->Get(v8::String::NewFromUtf8(isolate(), "detail")), v8::Boolean::New(isolate(), true));
+        EXPECT_EQ(jsEvent->ToObject(isolate())->Get(v8AtomicString(isolate(), "detail")), v8::Boolean::New(isolate(), true));
     }
 
     static PassRefPtr<TestListener> create(ScriptState* scriptState)
     {
         return adoptRef(new TestListener(scriptState));
     }
 
 private:
     TestListener(ScriptState* scriptState)
         : V8AbstractEventListener(false, scriptState->world(), scriptState->isolate())
@@ skipping 28 matching lines @@
     V8TestingScope scope(isolate);
     customEvent.initCustomEvent("blah", false, false, WebSerializedScriptValue::serialize(v8::Boolean::New(isolate, true)));
     RefPtr<EventListener> listener = TestListener::create(scope.scriptState());
     frame->frame()->document()->addEventListener("blah", listener, false);
     frame->frame()->document()->dispatchEvent(event);
 
     Platform::current()->unitTestSupport()->unregisterAllMockedURLs();
 }
 
 }