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Convert NavigationAndLoadCallbacksTest to use EmbeddedTestServer.

NavigationAndLoadCallbacksTest used deprecated web::HttpServer.

Bug: 708307
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I817cf817467bde8e531e75a19d866c43daac7412
Reviewed-on: https://chromium-review.googlesource.com/899604Reviewed-by: Menglu Huang <huangml@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534121}