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This merges FinishGoToIndex(), FinishReload(), and
FinishLoadURLWithParams() into their respective callers.
These were previously separate methods so that subclasses
of NavigationManagerImpl could provide different implementations,
but there are no longer any such subclasses.

Bug: 738020
Change-Id: I798415144ba48c59f8c892300b23413de9c9ab7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2581301Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Ali Juma <ajuma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835735}