Remove SimulateNavigationCommit from content/public API

This CL removes RenderFrameHostTester::SimulateNavigationCommit from the
content/ public API. Use NavigationSimulator to simulate navigations
instead.

BUG=728571

Change-Id: I691df4385c202f261d0f543b3cc11b9e59038946
Reviewed-on: https://chromium-review.googlesource.com/623809
Commit-Queue: Camille Lamy <clamy@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#496699}
4 files changed