Literal AtomicString construction can rely on strlen optimization.

third_party/WebKit/Source/core/html/track/AudioTrack.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/html/track/AudioTrack.h"
 
 #include "core/html/HTMLMediaElement.h"
 
 namespace blink {
 
@@ skipping 19 matching lines @@
         return;
 
     m_enabled = enabled;
 
     if (mediaElement())
         mediaElement()->audioTrackChanged();
 }
 
 const AtomicString& AudioTrack::alternativeKeyword()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("alternative", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("alternative"));
     return keyword;
 }
 
 const AtomicString& AudioTrack::descriptionsKeyword()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("descriptions", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("descriptions"));
     return keyword;
 }
 
 const AtomicString& AudioTrack::mainKeyword()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("main", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("main"));
     return keyword;
 }
 
 const AtomicString& AudioTrack::mainDescriptionsKeyword()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("main-desc", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("main-desc"));
     return keyword;
 }
 
 const AtomicString& AudioTrack::translationKeyword()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("translation", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("translation"));
     return keyword;
 }
 
 const AtomicString& AudioTrack::commentaryKeyword()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("commentary", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("commentary"));
     return keyword;
 }
 
 bool AudioTrack::isValidKindKeyword(const String& kind)
 {
     return (kind == alternativeKeyword())
         || (kind == descriptionsKeyword())
         || (kind == mainKeyword())
         || (kind == mainDescriptionsKeyword())
         || (kind == translationKeyword())
         || (kind == commentaryKeyword())
         || (kind == emptyAtom);
 }
 
 AtomicString AudioTrack::defaultKind() const
 {
     return emptyAtom;
 }
 
 } // namespace blink