Revert 213862 "net: make QUIC ProofVerifier more generic."

Revert 213862 "net: make QUIC ProofVerifier more generic."

> net: make QUIC ProofVerifier more generic.
> 
> The QUIC ProofVerifier code is currently rather Chromium specific: it's using
> weak pointers, base::Bind etc. This change wraps abstractions around things so
> that the code is more portable again.
> 
> It also solves an issue where, when a QUIC connection is canceled while a
> verification is running, the verification can write into free memory.
> 
> I went back and forth on this change a bit. It effectively reinvents weak
> pointers and callbacks in order not to use the Chromium versions of these
> things. This is unfortunate but it is desirable to minimise the amount of skew
> between different copies of the QUIC code. In the end, the duplicate didn't
> seem so bad to me.
> 
> Weak pointers are replaced with an explicit callback interface for the
> ProofVerifier. The QUIC client stream implements a Cancel method so that it can
> cope with being deleted while a proof verification is still running.
> 
> The need to store a CertVerifyDetails is taken care of with an abstract class
> for wrapping "implementation specific" results from a verification. There is
> still Chromium-specific code that casts it to a Chromium object, but that's
> unavoidable somewhere. (Although it's not clear that the QUIC client stream is
> the best place for it.)
> 
> BUG=none
> 
> Review URL: https://chromiumcodereview.appspot.com/20047002

TBR=agl@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=214033

[kareng, 2013-07-27 04:50:33]

Committed patchset #1 manually as r214033.