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The ui::PAGE_TRANSITION_FORWARD_BACK bit has always been set for
different-document back/forward navigation. It's not clear why
same-document back/forward navigation should be treated differently.
Making this change matches the Blink behavior (so should be low risk)
and removes a special case.

Bug: 798832
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I39e7a28caa9069cbb12ebdc965918792b36b77b2
Reviewed-on: https://chromium-review.googlesource.com/847940
Commit-Queue: Danyao Wang <danyao@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#527105}