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This refactors the chromedriver unit tests, particularly those in net_util_unittest,
sync_websocket_unittest, and websocket_unittest, as well as the TestHttpServer class,
to use the network service's HttpServer class (instead of the one in net/).

Bug: 821000
Change-Id: Icc4479b656936f38e86d104004d1dd703d845dda
Reviewed-on: https://chromium-review.googlesource.com/1038544
Commit-Queue: Lily Houghton <lilyhoughton@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Reviewed-by: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560310}