Literal AtomicString construction can rely on strlen optimization.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 45 matching lines @@
 
 LayoutObject* HTMLButtonElement::createLayoutObject(const ComputedStyle&)
 {
     return new LayoutButton(this);
 }
 
 const AtomicString& HTMLButtonElement::formControlType() const
 {
     switch (m_type) {
     case SUBMIT: {
-        DEFINE_STATIC_LOCAL(const AtomicString, submit, ("submit", AtomicString::ConstructFromLiteral));
+        DEFINE_STATIC_LOCAL(const AtomicString, submit, ("submit"));
         return submit;
     }
     case BUTTON: {
-        DEFINE_STATIC_LOCAL(const AtomicString, button, ("button", AtomicString::ConstructFromLiteral));
+        DEFINE_STATIC_LOCAL(const AtomicString, button, ("button"));
         return button;
     }
     case RESET: {
-        DEFINE_STATIC_LOCAL(const AtomicString, reset, ("reset", AtomicString::ConstructFromLiteral));
+        DEFINE_STATIC_LOCAL(const AtomicString, reset, ("reset"));
         return reset;
     }
     }
 
     ASSERT_NOT_REACHED();
     return emptyAtom;
 }
 
 bool HTMLButtonElement::isPresentationAttribute(const QualifiedName& name) const
 {
@@ skipping 137 matching lines @@
 }
 
 Node::InsertionNotificationRequest HTMLButtonElement::insertedInto(ContainerNode* insertionPoint)
 {
     InsertionNotificationRequest request = HTMLFormControlElement::insertedInto(insertionPoint);
     logAddElementIfIsolatedWorldAndInDocument("button", typeAttr, formmethodAttr, formactionAttr);
     return request;
 }
 
 } // namespace blink