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This CL ensures that PlzNavigate aka browser-side navigation is always
enabled. Renderer-side navigation is no longer supported.

BUG= 789577

Change-Id: Icc8f99966ae562799ebd44d077287970702d642f
Reviewed-on: https://chromium-review.googlesource.com/832651
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#525330}