Literal AtomicString construction can rely on strlen optimization.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004-2008, 2013, 2014 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2011 Motorola Mobility. All rights reserved.
  *
  * 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
@@ skipping 648 matching lines @@
 {
     setAttribute(translateAttr, enable ? "yes" : "no");
 }
 
 // Returns the conforming 'dir' value associated with the state the attribute is in (in its canonical case), if any,
 // or the empty string if the attribute is in a state that has no associated keyword value or if the attribute is
 // not in a defined state (e.g. the attribute is missing and there is no missing value default).
 // http://www.whatwg.org/specs/web-apps/current-work/multipage/common-dom-interfaces.html#limited-to-only-known-values
 static inline const AtomicString& toValidDirValue(const AtomicString& value)
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, ltrValue, ("ltr", AtomicString::ConstructFromLiteral));
-    DEFINE_STATIC_LOCAL(const AtomicString, rtlValue, ("rtl", AtomicString::ConstructFromLiteral));
-    DEFINE_STATIC_LOCAL(const AtomicString, autoValue, ("auto", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, ltrValue, ("ltr"));
+    DEFINE_STATIC_LOCAL(const AtomicString, rtlValue, ("rtl"));
+    DEFINE_STATIC_LOCAL(const AtomicString, autoValue, ("auto"));
 
     if (equalIgnoringCase(value, ltrValue))
         return ltrValue;
     if (equalIgnoringCase(value, rtlValue))
         return rtlValue;
     if (equalIgnoringCase(value, autoValue))
         return autoValue;
     return nullAtom;
 }
 
@@ skipping 341 matching lines @@
         return;
     int charCode = event->charCode();
     if (charCode == '\r' || charCode == ' ') {
         dispatchSimulatedClick(event);
         event->setDefaultHandled();
     }
 }
 
 const AtomicString& HTMLElement::eventParameterName()
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, eventString, ("event", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, eventString, ("event"));
     return eventString;
 }
 
 } // namespace blink
 
 #ifndef NDEBUG
 
 // For use in the debugger
 void dumpInnerHTML(blink::HTMLElement*);
 
 void dumpInnerHTML(blink::HTMLElement* element)
 {
     printf("%s\n", element->innerHTML().ascii().data());
 }
 #endif