Literal AtomicString construction can rely on strlen optimization.

third_party/WebKit/Source/core/html/track/VideoTrack.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/VideoTrack.h"
 
 #include "core/html/HTMLMediaElement.h"
 
 namespace blink {
 
@@ skipping 21 matching lines @@
     m_selected = selected;
 
     if (mediaElement()) {
         WebMediaPlayer::TrackId selectedTrackId = trackId();
         mediaElement()->selectedVideoTrackChanged(selected ? &selectedTrackId : 0);
     }
 }
 
 const AtomicString& VideoTrack::alternativeKeyword()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("alternative", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("alternative"));
     return keyword;
 }
 
 const AtomicString& VideoTrack::captionsKeyword()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("captions", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("captions"));
     return keyword;
 }
 
 const AtomicString& VideoTrack::mainKeyword()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("main", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("main"));
     return keyword;
 }
 
 const AtomicString& VideoTrack::signKeyword()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("sign", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("sign"));
     return keyword;
 }
 
 const AtomicString& VideoTrack::subtitlesKeyword()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("subtitles", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("subtitles"));
     return keyword;
 }
 
 const AtomicString& VideoTrack::commentaryKeyword()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("commentary", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, keyword, ("commentary"));
     return keyword;
 }
 
 bool VideoTrack::isValidKindKeyword(const String& kind)
 {
     return (kind == alternativeKeyword())
         || (kind == captionsKeyword())
         || (kind == mainKeyword())
         || (kind == signKeyword())
         || (kind == subtitlesKeyword())
         || (kind == commentaryKeyword())
         || (kind == emptyAtom);
 }
 
 AtomicString VideoTrack::defaultKind() const
 {
     return emptyAtom;
 }
 
 } // namespace blink