Smart Lock: Remove easy_unlock_private_api.

This is now unused.

R=tbarzic@chromium.org
TBR=droger@chromium.org

TBRing David for the removal of EnsureAPIBrowserContextKeyedServiceFactoriesBuilt() from chrome_browser_main_extra_parts_profiles.cc.

Bug: 899324
Test: none
Change-Id: Ife19019fd8b05dfcd627e92167f485e96401662b
Reviewed-on: https://chromium-review.googlesource.com/c/1319340
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: James Hawkins <jhawkins@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606516}
25 files changed