Literal AtomicString construction can rely on strlen optimization.

third_party/WebKit/Source/core/fetch/CrossOriginAccessControl.cpp

 /*
  * Copyright (C) 2008 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 111 matching lines @@
     return statusCode >= 400;
 }
 
 static String buildAccessControlFailureMessage(const String& detail, SecurityOrigin* securityOrigin)
 {
     return detail + " Origin '" + securityOrigin->toString() + "' is therefore not allowed access.";
 }
 
 bool passesAccessControlCheck(const ResourceResponse& response, StoredCredentials includeCredentials, SecurityOrigin* securityOrigin, String& errorDescription, WebURLRequest::RequestContext context)
 {
-    DEFINE_THREAD_SAFE_STATIC_LOCAL(AtomicString, allowOriginHeaderName, (new AtomicString("access-control-allow-origin", AtomicString::ConstructFromLiteral)));
-    DEFINE_THREAD_SAFE_STATIC_LOCAL(AtomicString, allowCredentialsHeaderName, (new AtomicString("access-control-allow-credentials", AtomicString::ConstructFromLiteral)));
-    DEFINE_THREAD_SAFE_STATIC_LOCAL(AtomicString, allowSuboriginHeaderName, (new AtomicString("access-control-allow-suborigin", AtomicString::ConstructFromLiteral)));
+    DEFINE_THREAD_SAFE_STATIC_LOCAL(AtomicString, allowOriginHeaderName, (new AtomicString("access-control-allow-origin")));
+    DEFINE_THREAD_SAFE_STATIC_LOCAL(AtomicString, allowCredentialsHeaderName, (new AtomicString("access-control-allow-credentials")));
+    DEFINE_THREAD_SAFE_STATIC_LOCAL(AtomicString, allowSuboriginHeaderName, (new AtomicString("access-control-allow-suborigin")));
 
     int statusCode = response.httpStatusCode();
 
     if (!statusCode) {
         errorDescription = buildAccessControlFailureMessage("Invalid response.", securityOrigin);
         return false;
     }
 
     const AtomicString& allowOriginHeaderValue = response.httpHeaderField(allowOriginHeaderName);
 
@@ skipping 144 matching lines @@
         newRequest.setHTTPOrigin(securityOrigin);
         // If the user didn't request credentials in the first place, update our
         // state so we neither request them nor expect they must be allowed.
         if (options.credentialsRequested == ClientDidNotRequestCredentials)
             options.allowCredentials = DoNotAllowStoredCredentials;
     }
     return true;
 }
 
 } // namespace blink