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NavigateInRenderer was using a non-standard method of waiting for
navigations, (written in 2010). Now there is a much simpler way to
do this.

This cleanup has the pleasant side effect of fixing some test failures
when BackForwardCache is enabled.

Change-Id: I96b3d3d93fb9b58485cf0f7c7f33751a1abf55f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1813350
Commit-Queue: Lowell Manners <lowell@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699731}