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Remove some duplicate code between NavigationURLLoaderImpl and ResourceDispatcherHostImpl::BeginNavigationRequest.

Change-Id: I7befae9ca3d332d5d31a5d0424de8eeb355a8810
Reviewed-on: https://chromium-review.googlesource.com/c/1325151
Commit-Queue: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606372}