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This moves WILL_START_REQUEST and CANCELING to
NavigationRequest::NavigationState. And removes INITIAL and uses
navigation_handle_id instead.

Bug: 916537
Change-Id: Ibe078a9d2947adb5baead6c5d499d79a7fff201f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816507Reviewed-by: Camille Lamy <clamy@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Commit-Queue: Mohamed Abdelhalim <zetamoo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711249}