Literal AtomicString construction can rely on strlen optimization.

third_party/WebKit/Source/modules/accessibility/AXLayoutObject.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
@@ skipping 1307 matching lines @@
 
     return !ariaOwns.isEmpty();
 }
 
 //
 // ARIA live-region features.
 //
 
 const AtomicString& AXLayoutObject::liveRegionStatus() const
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, liveRegionStatusAssertive, ("assertive", AtomicString::ConstructFromLiteral));
-    DEFINE_STATIC_LOCAL(const AtomicString, liveRegionStatusPolite, ("polite", AtomicString::ConstructFromLiteral));
-    DEFINE_STATIC_LOCAL(const AtomicString, liveRegionStatusOff, ("off", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, liveRegionStatusAssertive, ("assertive"));
+    DEFINE_STATIC_LOCAL(const AtomicString, liveRegionStatusPolite, ("polite"));
+    DEFINE_STATIC_LOCAL(const AtomicString, liveRegionStatusOff, ("off"));
 
     const AtomicString& liveRegionStatus = getAttribute(aria_liveAttr);
     // These roles have implicit live region status.
     if (liveRegionStatus.isEmpty()) {
         switch (roleValue()) {
         case AlertDialogRole:
         case AlertRole:
             return liveRegionStatusAssertive;
         case LogRole:
         case StatusRole:
             return liveRegionStatusPolite;
         case TimerRole:
         case MarqueeRole:
             return liveRegionStatusOff;
         default:
             break;
         }
     }
 
     return liveRegionStatus;
 }
 
 const AtomicString& AXLayoutObject::liveRegionRelevant() const
 {
-    DEFINE_STATIC_LOCAL(const AtomicString, defaultLiveRegionRelevant, ("additions text", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(const AtomicString, defaultLiveRegionRelevant, ("additions text"));
     const AtomicString& relevant = getAttribute(aria_relevantAttr);
 
     // Default aria-relevant = "additions text".
     if (relevant.isEmpty())
         return defaultLiveRegionRelevant;
 
     return relevant;
 }
 
 bool AXLayoutObject::liveRegionAtomic() const
@@ skipping 1157 matching lines @@
         if (label && label->layoutObject()) {
             LayoutRect labelRect = axObjectCache().getOrCreate(label)->elementRect();
             result.unite(labelRect);
         }
     }
 
     return result;
 }
 
 } // namespace blink