Literal AtomicString construction can rely on strlen optimization.

third_party/WebKit/Source/core/loader/FormSubmission.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 73 matching lines @@
 
 void FormSubmission::Attributes::parseAction(const String& action)
 {
     // m_action cannot be converted to KURL (bug https://crbug.com/388664)
     m_action = stripLeadingAndTrailingHTMLSpaces(action);
 }
 
 AtomicString FormSubmission::Attributes::parseEncodingType(const String& type)
 {
     if (equalIgnoringCase(type, "multipart/form-data"))
-        return AtomicString("multipart/form-data", AtomicString::ConstructFromLiteral);
+        return AtomicString("multipart/form-data");
     if (equalIgnoringCase(type, "text/plain"))
-        return AtomicString("text/plain", AtomicString::ConstructFromLiteral);
-    return AtomicString("application/x-www-form-urlencoded", AtomicString::ConstructFromLiteral);
+        return AtomicString("text/plain");
+    return AtomicString("application/x-www-form-urlencoded");
 }
 
 void FormSubmission::Attributes::updateEncodingType(const String& type)
 {
     m_encodingType = parseEncodingType(type);
     m_isMultiPartForm = (m_encodingType == "multipart/form-data");
 }
 
 FormSubmission::SubmitMethod FormSubmission::Attributes::parseMethodType(const String& type)
 {
@@ skipping 88 matching lines @@
 
     Document& document = form->document();
     KURL actionURL = document.completeURL(copiedAttributes.action().isEmpty() ? document.url().getString() : copiedAttributes.action());
     bool isMailtoForm = actionURL.protocolIs("mailto");
     bool isMultiPartForm = false;
     AtomicString encodingType = copiedAttributes.encodingType();
 
     if (copiedAttributes.method() == PostMethod) {
         isMultiPartForm = copiedAttributes.isMultiPartForm();
         if (isMultiPartForm && isMailtoForm) {
-            encodingType = AtomicString("application/x-www-form-urlencoded", AtomicString::ConstructFromLiteral);
+            encodingType = AtomicString("application/x-www-form-urlencoded");
             isMultiPartForm = false;
         }
     }
     WTF::TextEncoding dataEncoding = isMailtoForm ? UTF8Encoding() : FormDataEncoder::encodingFromAcceptCharset(copiedAttributes.acceptCharset(), document.encoding());
     FormData* domFormData = FormData::create(dataEncoding.encodingForFormSubmission());
 
     bool containsPasswordData = false;
     for (unsigned i = 0; i < form->associatedElements().size(); ++i) {
         FormAssociatedElement* control = form->associatedElements()[i];
         ASSERT(control);
@@ skipping 57 matching lines @@
         if (m_boundary.isEmpty())
             frameRequest.resourceRequest().setHTTPContentType(m_contentType);
         else
             frameRequest.resourceRequest().setHTTPContentType(m_contentType + "; boundary=" + m_boundary);
     }
 
     frameRequest.resourceRequest().setURL(requestURL());
 }
 
 } // namespace blink