Remove old navigation code from RenderFrameHostManager

This CL cleans up the old navigation code from RenderFrameHostManager.

Bug: 789577
Change-Id: Ib7b01df9e7fd3b87361f386725837e4022c4c454
Reviewed-on: https://chromium-review.googlesource.com/840030
Commit-Queue: John Abd-El-Malek <[email protected]>
Reviewed-by: John Abd-El-Malek <[email protected]>
Reviewed-by: Egor Pasko <[email protected]>
Cr-Commit-Position: refs/heads/master@{#526007}
21 files changed