Literal AtomicString construction can rely on strlen optimization.

third_party/WebKit/Source/core/loader/FormSubmission.h

 /*
  * 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 36 matching lines @@
 public:
     enum SubmitMethod { GetMethod, PostMethod, DialogMethod };
 
     class Attributes {
         DISALLOW_NEW();
         WTF_MAKE_NONCOPYABLE(Attributes);
     public:
         Attributes()
             : m_method(GetMethod)
             , m_isMultiPartForm(false)
-            , m_encodingType("application/x-www-form-urlencoded", AtomicString::ConstructFromLiteral)
+            , m_encodingType("application/x-www-form-urlencoded")
         {
         }
 
         SubmitMethod method() const { return m_method; }
         static SubmitMethod parseMethodType(const String&);
         void updateMethodType(const String&);
         static String methodString(SubmitMethod);
 
         const String& action() const { return m_action; }
         void parseAction(const String&);
@@ skipping 51 matching lines @@
     RefPtrWillBeMember<HTMLFormElement> m_form;
     RefPtr<EncodedFormData> m_formData;
     String m_boundary;
     RefPtrWillBeMember<Event> m_event;
     String m_result;
 };
 
 } // namespace blink
 
 #endif // FormSubmission_h