Literal AtomicString construction can rely on strlen optimization.

third_party/WebKit/Source/core/html/track/vtt/VTTCue.cpp

 /*
  * Copyright (c) 2013, Opera Software ASA. 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 130 matching lines @@
     CSSPropertyID propertyID, const String& value)
 {
     if (!value.isEmpty())
         element.setInlineStyleProperty(propertyID, value);
 }
 
 VTTCueBox::VTTCueBox(Document& document)
     : HTMLDivElement(document)
     , m_snapToLinesPosition(std::numeric_limits<float>::quiet_NaN())
 {
-    setShadowPseudoId(AtomicString("-webkit-media-text-track-display", AtomicString::ConstructFromLiteral));
+    setShadowPseudoId(AtomicString("-webkit-media-text-track-display"));
 }
 
 void VTTCueBox::applyCSSProperties(const VTTDisplayParameters& displayParameters)
 {
     // http://dev.w3.org/html5/webvtt/#applying-css-properties-to-webvtt-node-objects
 
     // Initialize the (root) list of WebVTT Node Objects with the following CSS settings:
 
     // the 'position' property must be set to 'absolute'
     setInlineStyleProperty(CSSPropertyPosition, CSSValueAbsolute);
@@ skipping 979 matching lines @@
 
 DEFINE_TRACE(VTTCue)
 {
     visitor->trace(m_vttNodeTree);
     visitor->trace(m_cueBackgroundBox);
     visitor->trace(m_displayTree);
     TextTrackCue::trace(visitor);
 }
 
 } // namespace blink