Make Document.charset an alias of characterSet, as per spec

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 190 matching lines @@
     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);
             isMultiPartForm = false;
         }
     }
-    WTF::TextEncoding dataEncoding = isMailtoForm ? UTF8Encoding() : FormDataEncoder::encodingFromAcceptCharset(copiedAttributes.acceptCharset(), document.charset(), document.defaultCharset());
+    WTF::TextEncoding dataEncoding = isMailtoForm ? UTF8Encoding() : FormDataEncoder::encodingFromAcceptCharset(copiedAttributes.acceptCharset(), document.characterSet(), document.defaultCharset());
     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);
         HTMLElement& element = toHTMLElement(*control);
         if (!element.isDisabledFormControl())
             control->appendToFormData(*domFormData);
         if (isHTMLInputElement(element)) {
@@ skipping 53 matching lines @@
         if (m_boundary.isEmpty())
             frameRequest.resourceRequest().setHTTPContentType(m_contentType);
         else
             frameRequest.resourceRequest().setHTTPContentType(m_contentType + "; boundary=" + m_boundary);
     }
 
     frameRequest.resourceRequest().setURL(requestURL());
 }
 
 }