Literal AtomicString construction can rely on strlen optimization.

third_party/WebKit/Source/core/html/shadow/SpinButtonElement.cpp

 /*
  * Copyright (C) 2006, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 36 matching lines @@
     , m_capturing(false)
     , m_upDownState(Indeterminate)
     , m_pressStartingState(Indeterminate)
     , m_repeatingTimer(this, &SpinButtonElement::repeatingTimerFired)
 {
 }
 
 PassRefPtrWillBeRawPtr<SpinButtonElement> SpinButtonElement::create(Document& document, SpinButtonOwner& spinButtonOwner)
 {
     RefPtrWillBeRawPtr<SpinButtonElement> element = adoptRefWillBeNoop(new SpinButtonElement(document, spinButtonOwner));
-    element->setShadowPseudoId(AtomicString("-webkit-inner-spin-button", AtomicString::ConstructFromLiteral));
+    element->setShadowPseudoId(AtomicString("-webkit-inner-spin-button"));
     element->setAttribute(idAttr, ShadowElementNames::spinButton());
     return element.release();
 }
 
 void SpinButtonElement::detach(const AttachContext& context)
 {
     releaseCapture(EventDispatchDisallowed);
     HTMLDivElement::detach(context);
 }
 
@@ skipping 188 matching lines @@
     return !m_spinButtonOwner || m_spinButtonOwner->shouldSpinButtonRespondToMouseEvents();
 }
 
 DEFINE_TRACE(SpinButtonElement)
 {
     visitor->trace(m_spinButtonOwner);
     HTMLDivElement::trace(visitor);
 }
 
 } // namespace blink