Replace URLRequestContextBuilder::HttpNetworkSessionParams
with HttpNetworkSession::Params.  The former was a subset of
the latter.  This allows almost any configuration option to
be applied to an HttpNetworkSession created by a
URLRequestContextBuilder.

TBR=tobiasjs@chromium.org
BUG=715695

Review-Url: https://codereview.chromium.org/2901383006
Cr-Commit-Position: refs/heads/master@{#476109}
4 files changed