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The WebKit History API bug only affects push/replaceState calls that
change the URL path and query from file:// scheme. It turns out that
changing URL fragment is still allowed. This CL reimplements restore
session behavior by encoding all data in URL fragment and removes the
iOS11.3 guard for WebClient::IsSlimNavigationManagerEnabled().

Bug: 814803
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ib26734b2d62cbcfc1d8f8844e317fdb5842b6b16
Reviewed-on: https://chromium-review.googlesource.com/1024929
Commit-Queue: Danyao Wang <danyao@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553119}