Make Resource::resourceBuffer() to return PassRefPtr<const SharedBuffer>

third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013, Intel Corporation
  *
  * 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.
@@ skipping 929 matching lines @@
     handleResponse(identifier, response, nullptr);
 
     // handleResponse() may detect an error. In such a case (check |m_client|
     // as it gets reset by clear() call), skip the rest.
     //
     // |this| is alive here since loadResourceSynchronously() keeps it alive
     // until the end of the function.
     if (!m_client)
         return;
 
-    RefPtr<SharedBuffer> data = resource->resourceBuffer();
+    RefPtr<const SharedBuffer> data = resource->resourceBuffer();
     if (data)
         handleReceivedData(data->data(), data->size());
 
     // The client may cancel this loader in handleReceivedData(). In such a
     // case, skip the rest.
     if (!m_client)
         return;
 
     handleSuccessfulFinish(identifier, 0.0);
 }
@@ skipping 26 matching lines @@
 
 DEFINE_TRACE(DocumentThreadableLoader)
 {
     visitor->trace(m_resource);
     visitor->trace(m_document);
     ThreadableLoader::trace(visitor);
     RawResourceClient::trace(visitor);
 }
 
 } // namespace blink