Revert 150124 - Implement SHA-256 fingerprint support.

Revert 150124 - Implement SHA-256 fingerprint support.

The HTTP-based Public Key Pinning Internet Draft
(tools.ietf.org/html/draft-ietf-websec-key-pinning) requires this.

Per wtc, give the *Fingeprint* types more meaningful *HashValue* names.

Cleaning up lint along the way.

This CL reverts 149268, which reverted 149261 the previous version of this
CL. It includes a fix to the compile problem that necessitated 149268.

BUG=117914
TEST=net_unittests, unit_tests TransportSecurityPersisterTest
Review URL: https://chromiumcodereview.appspot.com/10836062

TBR=palmer@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=150166

[Jeffrey Yasskin, 2012-08-06 23:36:33]

https://chromiumcodereview.appspot.com/10836120/diff/1/net/base/x509_cert_typ...
File net/base/x509_cert_types.h (left):

https://chromiumcodereview.appspot.com/10836120/diff/1/net/base/x509_cert_typ...
net/base/x509_cert_types.h:100: return 0;
For Chris: I suspect that returning "sizeof(fingerprint)" here instead of 0 will
fix the problem. I'd be interested to hear if it doesn't.

[palmer, 2012-08-06 23:38:32]

> net/base/x509_cert_types.h:100: return 0;
> For Chris: I suspect that returning "sizeof(fingerprint)" here instead of 0
will
> fix the problem. I'd be interested to hear if it doesn't.

Thank you Jeffrey! I'm trying that (well, something substantially like it) now:

https://chromiumcodereview.appspot.com/10825211/