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Rather than have SpdySessionPool and the socket pools listen to both
SSLClientContext and the CertDatabase separately, lump them both under
SSL-external notifications of SSL state changing.

(Note ClientSocketPoolManagerImpl's SSLClientContext::Observer
counterpart is TransportClientSocketPool. Also note this fixes
an inconsistency between HTTP/1.1 and HTTP/2. HTTP/2 had a
ERR_NETWORK_CHANGED vs ERR_CERT_DATABASE_CHANGED distinction while
HTTP/1.1 did not. I've made them both match.)

Change-Id: Ibde71856fc1d605757dbf869ce1eba482a6bbafc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1703232
Commit-Queue: David Benjamin <davidben@chromium.org>
Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683760}