Literal AtomicString construction can rely on strlen optimization.

third_party/WebKit/Source/core/html/HTMLKeygenElement.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, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * 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 53 matching lines @@
 LayoutObject* HTMLKeygenElement::createLayoutObject(const ComputedStyle& style)
 {
     // TODO(mstensho): While it's harmful and meaningless to allow most display types on replaced
     // content (e.g. table, table-row or flex), it would be useful to honor at least some of
     // them. Table-cell (and maybe table-caption too), for instance. See crbug.com/335040
     return new LayoutBlockFlow(this);
 }
 
 void HTMLKeygenElement::didAddUserAgentShadowRoot(ShadowRoot& root)
 {
-    DEFINE_STATIC_LOCAL(AtomicString, keygenSelectPseudoId, ("-webkit-keygen-select", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(AtomicString, keygenSelectPseudoId, ("-webkit-keygen-select"));
 
     Vector<String> keys;
     keys.reserveCapacity(2);
     keys.append(locale().queryString(WebLocalizedString::KeygenMenuHighGradeKeySize));
     keys.append(locale().queryString(WebLocalizedString::KeygenMenuMediumGradeKeySize));
 
     // Create a select element with one option element for each key size.
     RefPtrWillBeRawPtr<HTMLSelectElement> select = HTMLSelectElement::create(document());
     select->setShadowPseudoId(keygenSelectPseudoId);
     for (const String& key : keys) {
@@ skipping 23 matching lines @@
     SecurityOrigin* topOrigin = document().frame()->tree().top()->securityContext()->getSecurityOrigin();
     String value = Platform::current()->signedPublicKeyAndChallengeString(
         shadowSelect()->selectedIndex(), fastGetAttribute(challengeAttr), document().baseURL(),
         KURL(KURL(), topOrigin->toString()));
     if (!value.isNull())
         formData.append(name(), value);
 }
 
 const AtomicString& HTMLKeygenElement::formControlType() const
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, keygen, ("keygen", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, keygen, ("keygen"));
     return keygen;
 }
 
 void HTMLKeygenElement::resetImpl()
 {
     shadowSelect()->reset();
 }
 
 HTMLSelectElement* HTMLKeygenElement::shadowSelect() const
 {
     ShadowRoot* root = userAgentShadowRoot();
     return root ? toHTMLSelectElement(root->firstChild()) : 0;
 }
 
 bool HTMLKeygenElement::isInteractiveContent() const
 {
     return true;
 }
 
 bool HTMLKeygenElement::supportsAutofocus() const
 {
     return true;
 }
 
 } // namespace blink