Switch http_service_tests to use TestLauncher.

Previously, the http_service_tests suite was not using the TestLauncher
facilities, which caused it to fail on the waterfall.

Bug: 896884
Change-Id: I9ce03cf45f0bd75944dce62bed5e16e2df6a4191
Tested: Locally
Reviewed-on: https://chromium-review.googlesource.com/c/1292591
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601368}
3 files changed