Migrate WebHistoryService to SimpleURLLoader

Bug: 844934
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I480fe2d42be09e6b295f5e7f1e53548e1e912ede
Reviewed-on: https://chromium-review.googlesource.com/1072048
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Mark Pilgrim <pilgrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561846}
15 files changed