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Some navigations are both forward/back and reload. As far as
page_end_reason is concerned, these should be considered as history
navigations.

Most "true" reloads result in the user loading the same URL again (e.g.
pull-to-refresh or preview opt-out button). By contrast, navigations
that are both forward/back and reload navigations usually result in
loading a different URL.

Bug: 991741
Change-Id: Iac70ec0b62f6b9bd228419d127ae338ebb4ff5b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1743129Reviewed-by: Bryan McQuade <bmcquade@chromium.org>
Commit-Queue: Simon Pelchat <spelchat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686617}