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Navigation entries restored from a previously saved session are inserted
as restore_session.html?targetUrl=<target> URLs. The onload handler
redirects the page to the target URL when loaded. It turns out that
WKWebView does not fire onload handler in back/forward navigation
from an about:blank URL redirected from restore_session.html to another
restore_session.html. Most likely it's because WkWebView consiters this
a same-page navigation. This causes forward navigationt from a restored
app-specific URL to not load the web content.

This CL fixes it by forcing a reload in the WKWebView in this case.

Bug: 814790
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ie6e7ada39388cedd7357a582308f0edc1397ef63
Reviewed-on: https://chromium-review.googlesource.com/974365Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Danyao Wang <danyao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545166}