Add Next Protocol Negotiation (NPN) unittests.

* Replace enable_npn with npn_protocols in testserver.
* Update existing SSLClientSocket unittests to use the new option.
* Add SSLClientSocket unittests to test NPN behavior.

BUG=103127

Review URL: https://codereview.chromium.org/1372843004

Cr-Original-Commit-Position: refs/heads/master@{#352007}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: c7d5389e077b13bd153302a645070f746f72c8b8
1 file changed