Literal AtomicString construction can rely on strlen optimization.

third_party/WebKit/Source/core/html/HTMLMeterElement.cpp

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 176 matching lines @@
 void HTMLMeterElement::didElementStateChange()
 {
     updateValueAppearance(valueRatio() * 100);
 }
 
 void HTMLMeterElement::didAddUserAgentShadowRoot(ShadowRoot& root)
 {
     ASSERT(!m_value);
 
     RefPtrWillBeRawPtr<HTMLDivElement> inner = HTMLDivElement::create(document());
-    inner->setShadowPseudoId(AtomicString("-webkit-meter-inner-element", AtomicString::ConstructFromLiteral));
+    inner->setShadowPseudoId(AtomicString("-webkit-meter-inner-element"));
     root.appendChild(inner);
 
     RefPtrWillBeRawPtr<HTMLDivElement> bar = HTMLDivElement::create(document());
-    bar->setShadowPseudoId(AtomicString("-webkit-meter-bar", AtomicString::ConstructFromLiteral));
+    bar->setShadowPseudoId(AtomicString("-webkit-meter-bar"));
 
     m_value = HTMLDivElement::create(document());
     updateValueAppearance(0);
     bar->appendChild(m_value);
 
     inner->appendChild(bar);
 }
 
 void HTMLMeterElement::updateValueAppearance(double percentage)
 {
-    DEFINE_STATIC_LOCAL(AtomicString, optimumPseudoId, ("-webkit-meter-optimum-value", AtomicString::ConstructFromLiteral));
-    DEFINE_STATIC_LOCAL(AtomicString, suboptimumPseudoId, ("-webkit-meter-suboptimum-value", AtomicString::ConstructFromLiteral));
-    DEFINE_STATIC_LOCAL(AtomicString, evenLessGoodPseudoId, ("-webkit-meter-even-less-good-value", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(AtomicString, optimumPseudoId, ("-webkit-meter-optimum-value"));
+    DEFINE_STATIC_LOCAL(AtomicString, suboptimumPseudoId, ("-webkit-meter-suboptimum-value"));
+    DEFINE_STATIC_LOCAL(AtomicString, evenLessGoodPseudoId, ("-webkit-meter-even-less-good-value"));
 
     m_value->setInlineStyleProperty(CSSPropertyWidth, percentage, CSSPrimitiveValue::UnitType::Percentage);
     switch (getGaugeRegion()) {
     case GaugeRegionOptimum:
         m_value->setShadowPseudoId(optimumPseudoId);
         break;
     case GaugeRegionSuboptimal:
         m_value->setShadowPseudoId(suboptimumPseudoId);
         break;
     case GaugeRegionEvenLessGood:
         m_value->setShadowPseudoId(evenLessGoodPseudoId);
         break;
     }
 }
 
 DEFINE_TRACE(HTMLMeterElement)
 {
     visitor->trace(m_value);
     LabelableElement::trace(visitor);
 }
 
 } // namespace blink