Literal AtomicString construction can rely on strlen optimization.

third_party/WebKit/Source/platform/network/HTTPParsers.cpp

 /*
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2011 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:
@@ skipping 622 matching lines @@
     }
 }
 
 CacheControlHeader parseCacheControlDirectives(const AtomicString& cacheControlValue, const AtomicString& pragmaValue)
 {
     CacheControlHeader cacheControlHeader;
     cacheControlHeader.parsed = true;
     cacheControlHeader.maxAge = std::numeric_limits<double>::quiet_NaN();
     cacheControlHeader.staleWhileRevalidate = std::numeric_limits<double>::quiet_NaN();
 
-    DEFINE_STATIC_LOCAL(const AtomicString, noCacheDirective, ("no-cache", AtomicString::ConstructFromLiteral));
-    DEFINE_STATIC_LOCAL(const AtomicString, noStoreDirective, ("no-store", AtomicString::ConstructFromLiteral));
-    DEFINE_STATIC_LOCAL(const AtomicString, mustRevalidateDirective, ("must-revalidate", AtomicString::ConstructFromLiteral));
-    DEFINE_STATIC_LOCAL(const AtomicString, maxAgeDirective, ("max-age", AtomicString::ConstructFromLiteral));
-    DEFINE_STATIC_LOCAL(const AtomicString, staleWhileRevalidateDirective, ("stale-while-revalidate", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, noCacheDirective, ("no-cache"));
+    DEFINE_STATIC_LOCAL(const AtomicString, noStoreDirective, ("no-store"));
+    DEFINE_STATIC_LOCAL(const AtomicString, mustRevalidateDirective, ("must-revalidate"));
+    DEFINE_STATIC_LOCAL(const AtomicString, maxAgeDirective, ("max-age"));
+    DEFINE_STATIC_LOCAL(const AtomicString, staleWhileRevalidateDirective, ("stale-while-revalidate"));
 
     if (!cacheControlValue.isEmpty()) {
         Vector<std::pair<String, String>> directives;
         parseCacheHeader(cacheControlValue, directives);
 
         size_t directivesSize = directives.size();
         for (size_t i = 0; i < directivesSize; ++i) {
             // RFC2616 14.9.1: A no-cache directive with a value is only meaningful for proxy caches.
             // It should be ignored by a browser level cache.
             if (equalIgnoringCase(directives[i].first, noCacheDirective) && directives[i].second.isEmpty()) {
@@ skipping 91 matching lines @@
             return false;
         }
 
         position++;
     }
 
     return true;
 }
 
 } // namespace blink