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Since some VC's presented by SettingsNavigationController might not be
a SettingsRootTableViewController (e.g. GFBFeedbackViewController) this
CL sets currentPresentedSettingsViewController to nil if this case is true.

Bug: 980037
Change-Id: I5771c27c66820769756ba64b05354b13592e43b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1807024
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696900}