Literal AtomicString construction can rely on strlen optimization.

third_party/WebKit/Source/core/html/forms/BaseMultipleFieldsDateAndTimeInputType.cpp

 /*
  * Copyright (C) 2010 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 507 matching lines @@
     bool hasValue = false;
     if (!element().suggestedValue().isNull())
         hasValue = parseToDateComponents(element().suggestedValue(), &date);
     else
         hasValue = parseToDateComponents(element().value(), &date);
     if (!hasValue)
         setMillisecondToDateComponents(layoutParameters.stepRange.minimum().toDouble(), &date);
 
     setupLayoutParameters(layoutParameters, date);
 
-    DEFINE_STATIC_LOCAL(AtomicString, datetimeformatAttr, ("datetimeformat", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(AtomicString, datetimeformatAttr, ("datetimeformat"));
     edit->setAttribute(datetimeformatAttr, AtomicString(layoutParameters.dateTimeFormat), ASSERT_NO_EXCEPTION);
     const AtomicString pattern = edit->fastGetAttribute(HTMLNames::patternAttr);
     if (!pattern.isEmpty())
         layoutParameters.dateTimeFormat = pattern;
 
     if (!DateTimeFormatValidator().validateFormat(layoutParameters.dateTimeFormat, *this))
         layoutParameters.dateTimeFormat = layoutParameters.fallbackDateTimeFormat;
 
     if (hasValue)
         edit->setValueAsDate(layoutParameters, date);
@@ skipping 89 matching lines @@
 AXObject* BaseMultipleFieldsDateAndTimeInputType::popupRootAXObject()
 {
     if (PickerIndicatorElement* picker = pickerIndicatorElement())
         return picker->popupRootAXObject();
     return nullptr;
 }
 
 } // namespace blink
 
 #endif