GitLab

ProxyResolvingClientSocketFactory takes care of creating a new
HttpNetworkSession that is based on a given net::URLRequestContext.

This CL switches GCM's ConnectionFactoryImpl to using
ProxyResolvingClientSocketFactory, so there is less code duplication. This
will makes it easier to standardize usage of ProxyResolvingClientSocket to
prepare for servicifying it.

Bug: 844187
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: I06b1f6b7c6fc7e8c458b24f2ee3dcc5664bd4c21
Reviewed-on: https://chromium-review.googlesource.com/1101058
Commit-Queue: Helen Li <xunjieli@chromium.org>
Reviewed-by: Maks Orlovich <morlovich@chromium.org>
Reviewed-by: Nicolas Zea <zea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567674}