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This CL updates MainController to use a regular _settingsNavigationController
when presenting the Google services settings. This ensures that when the
user attempts to open an URL from the Google services settings, the regular
close settings and open URL command is executed.

Bug: 963436

Change-Id: Ibec138d6cd3baf34c43f713f43c1e9cb908a8382
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1621132
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662190}