Hi
In cef_ref_counted.h there is the following at line 195 (current release).
#if DCHECK_IS_ON()
~RefCountedThreadSafeBase();
This leaves the the destructor without a body as it is not defined anywhere else.
Might I suggest,
#if DCHECK_IS_ON()
~RefCountedThreadSafeBase() {}
I can create a patch for this but I'm not familiar with the style of the code so what I have suggested may not be correct.
Moonbase