Literal AtomicString construction can rely on strlen optimization.

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 248 matching lines @@
 
 HTMLInputElement* SliderThumbElement::hostInput() const
 {
     // Only HTMLInputElement creates SliderThumbElement instances as its shadow nodes.
     // So, shadowHost() must be an HTMLInputElement.
     return toHTMLInputElement(shadowHost());
 }
 
 static const AtomicString& sliderThumbShadowPartId()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, sliderThumb, ("-webkit-slider-thumb", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, sliderThumb, ("-webkit-slider-thumb"));
     return sliderThumb;
 }
 
 static const AtomicString& mediaSliderThumbShadowPartId()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, mediaSliderThumb, ("-webkit-media-slider-thumb", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, mediaSliderThumb, ("-webkit-media-slider-thumb"));
     return mediaSliderThumb;
 }
 
 const AtomicString& SliderThumbElement::shadowPseudoId() const
 {
     HTMLInputElement* input = hostInput();
     if (!input || !input->layoutObject())
         return sliderThumbShadowPartId();
 
     const ComputedStyle& sliderStyle = input->layoutObject()->styleRef();
@@ skipping 19 matching lines @@
 
 DEFINE_NODE_FACTORY(SliderContainerElement)
 
 LayoutObject* SliderContainerElement::createLayoutObject(const ComputedStyle&)
 {
     return new LayoutSliderContainer(this);
 }
 
 const AtomicString& SliderContainerElement::shadowPseudoId() const
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, mediaSliderContainer, ("-webkit-media-slider-container", AtomicString::ConstructFromLiteral));
-    DEFINE_STATIC_LOCAL(const AtomicString, sliderContainer, ("-webkit-slider-container", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, mediaSliderContainer, ("-webkit-media-slider-container"));
+    DEFINE_STATIC_LOCAL(const AtomicString, sliderContainer, ("-webkit-slider-container"));
 
     if (!shadowHost() || !shadowHost()->layoutObject())
         return sliderContainer;
 
     const ComputedStyle& sliderStyle = shadowHost()->layoutObject()->styleRef();
     switch (sliderStyle.appearance()) {
     case MediaSliderPart:
     case MediaSliderThumbPart:
     case MediaVolumeSliderPart:
     case MediaVolumeSliderThumbPart:
     case MediaFullScreenVolumeSliderPart:
     case MediaFullScreenVolumeSliderThumbPart:
         return mediaSliderContainer;
     default:
         return sliderContainer;
     }
 }
 
 } // namespace blink