Break core/platform/network dependency on core

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 208 matching lines @@
                 formValues.append(pair<String, String>(input->name().string(), input->value()));
             if (input->isPasswordField() && !input->value().isEmpty())
                 containsPasswordData = true;
         }
     }
 
     RefPtr<FormData> formData;
     String boundary;
 
     if (isMultiPartForm) {
-        formData = FormData::createMultiPart(*(static_cast<FormDataList*>(domFormData.get())), domFormData->encoding());
+        formData = domFormData->createMultiPartFormData(domFormData->encoding());
         boundary = formData->boundary().data();
     } else {
-        formData = FormData::create(*(static_cast<FormDataList*>(domFormData.get())), domFormData->encoding(), attributes.method() == GetMethod ? FormData::FormURLEncoded : FormData::parseEncodingType(encodingType));
+        formData = domFormData->createFormData(domFormData->encoding(), attributes.method() == GetMethod ? FormData::FormURLEncoded : FormData::parseEncodingType(encodingType));
         if (copiedAttributes.method() == PostMethod && isMailtoForm) {
             // Convert the form data into a string that we put into the URL.
             appendMailtoPostFormDataToURL(actionURL, *formData, encodingType);
             formData = FormData::create();
         }
     }
 
     formData->setIdentifier(generateFormDataIdentifier());
     formData->setContainsPasswordData(containsPasswordData);
     String targetOrBaseTarget = copiedAttributes.target().isEmpty() ? document.baseTarget() : copiedAttributes.target();
@@ skipping 28 matching lines @@
             frameRequest.resourceRequest().setHTTPContentType(m_contentType);
         else
             frameRequest.resourceRequest().setHTTPContentType(m_contentType + "; boundary=" + m_boundary);
     }
 
     frameRequest.resourceRequest().setURL(requestURL());
     FrameLoader::addHTTPOriginIfNeeded(frameRequest.resourceRequest(), m_origin);
 }
 
 }