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This is the 4th CL of multiple CLs to remove the usages of
NavigationHandleImpl completely and replace it with NavigationRequest.

This CL includes removing usages of functions of NavigationHandleImpl
from NavigationSimulatorImpl, and replacing them with functions of
NavigationRequest.

Bug: 995268
Change-Id: I4a538610cd78b7e6e8c207900318a35310d3fc4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1807113
Commit-Queue: Mohamed Abdelhalim <zetamoo@chromium.org>
Reviewed-by: Lowell Manners <lowell@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697581}