s/use_alternate_protocols/use_alternative_services/g

Rename HttpNetworkSession::Params::use_alternate_protocols,
SpdySessionDependencies::use_alternate_protocols, and
IOThread::Globals::use_alternate_protocols to use_alternative_services.

Also reformat some test-level comments, and remove some obsolete comments.

BUG=392575

Review URL: https://codereview.chromium.org/1268313004

Cr-Commit-Position: refs/heads/master@{#344284}
21 files changed