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

third_party/WebKit/Source/core/xml/parser/SharedBufferReader.h

 /*
  * Copyright (C) 2014 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 26 matching lines @@
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class SharedBuffer;
 
 // Allows transfer of data in multiple chunks from a SharedBuffer to a provided buffer.
 class CORE_EXPORT SharedBufferReader {
     USING_FAST_MALLOC(SharedBufferReader);
 public:
-    SharedBufferReader(PassRefPtr<SharedBuffer>);
+    SharedBufferReader(PassRefPtr<const SharedBuffer>);
 
     ~SharedBufferReader();
 
     // Returns the number of bytes that were read (i.e. written to |outputBuffer|).
     // TODO(junov): use size_t instead of int. Until then, readData uses safeCast internally.
     int readData(char* outputBuffer, int askedToRead);
 
 private:
-    RefPtr<SharedBuffer> m_buffer;
+    RefPtr<const SharedBuffer> m_buffer;
     size_t m_currentOffset;
 };
 
 } // namespace blink
 
 #endif // SharedBufferReader_h