Add tests for the fuchsia.oldhttp service.

This CL adds tests for the fuchsia.oldhttp service Chromium
implementation. These tests ensure the service is capable of sending
URL requests, receiving a response and/or an error code as expected.
The service implementation files have been moved around under a single
directory for consistency.

Bug: 874155
Change-Id: Iae843adc62db054a17125cea10b17771c127b801
Reviewed-on: https://chromium-review.googlesource.com/c/1239627
Reviewed-by: Matt Menke <[email protected]>
Reviewed-by: Bruce Dawson <[email protected]>
Reviewed-by: Kevin Marshall <[email protected]>
Commit-Queue: Fabrice de Gans-Riberi <[email protected]>
Cr-Commit-Position: refs/heads/master@{#600938}
diff --git a/BUILD.gn b/BUILD.gn
index 86ecdbdd..a149772 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -749,6 +749,7 @@
       "//webrunner:archive_sources",
       "//webrunner:webrunner_unittests",
       "//webrunner/net_http:http_pkg",
+      "//webrunner/net_http:http_service_tests",
     ]
   }