Literal AtomicString construction can rely on strlen optimization.

third_party/WebKit/Source/platform/weborigin/SecurityOrigin.cpp

 /*
  * Copyright (C) 2007 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 417 matching lines @@
     if (isUnique())
         return "null";
     if (isLocal() && m_blockLocalAccessFromLocalOrigin)
         return "null";
     return toRawString();
 }
 
 AtomicString SecurityOrigin::toAtomicString() const
 {
     if (isUnique())
-        return AtomicString("null", AtomicString::ConstructFromLiteral);
+        return AtomicString("null");
     if (isLocal() && m_blockLocalAccessFromLocalOrigin)
-        return AtomicString("null", AtomicString::ConstructFromLiteral);
+        return AtomicString("null");
     return toRawAtomicString();
 }
 
 String SecurityOrigin::toPhysicalOriginString() const
 {
     if (isUnique())
         return "null";
     if (isLocal() && m_blockLocalAccessFromLocalOrigin)
         return "null";
     return toRawStringIgnoreSuborigin();
@@ skipping 34 matching lines @@
     suboriginName = oldHost.substring(0, suboriginEnd);
     newHost = oldHost.substring(suboriginEnd + 1);
 
     return true;
 }
 
 
 AtomicString SecurityOrigin::toRawAtomicString() const
 {
     if (m_protocol == "file")
-        return AtomicString("file://", AtomicString::ConstructFromLiteral);
+        return AtomicString("file://");
 
     StringBuilder result;
     buildRawString(result, true);
     return result.toAtomicString();
 }
 
 void SecurityOrigin::buildRawString(StringBuilder& builder, bool includeSuborigin) const
 {
     builder.append(m_protocol);
     builder.appendLiteral("://");
@@ skipping 69 matching lines @@
     m_blockLocalAccessFromLocalOrigin = privilegeData->m_blockLocalAccessFromLocalOrigin;
 }
 
 void SecurityOrigin::setUniqueOriginIsPotentiallyTrustworthy(bool isUniqueOriginPotentiallyTrustworthy)
 {
     ASSERT(!isUniqueOriginPotentiallyTrustworthy || isUnique());
     m_isUniqueOriginPotentiallyTrustworthy = isUniqueOriginPotentiallyTrustworthy;
 }
 
 } // namespace blink