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

third_party/WebKit/Source/platform/SerializedResource.h

 /*
  * Copyright (C) 2013 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 24 matching lines @@
 #include "platform/weborigin/KURL.h"
 #include "wtf/Allocator.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 struct SerializedResource {
     DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
     KURL url;
     String mimeType;
-    RefPtr<SharedBuffer> data;
+    RefPtr<const SharedBuffer> data;
 
-    SerializedResource(const KURL& url, const String& mimeType, PassRefPtr<SharedBuffer> data)
+    SerializedResource(const KURL& url, const String& mimeType, PassRefPtr<const SharedBuffer> data)
         : url(url)
         , mimeType(mimeType)
         , data(data)
     {
     }
 };
 
 } // namespace blink
 
 #endif // SerializedResource_h