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This patch removes dead code in MainController, ApplicationSettingsCommands and
SettingsNavigationController, related to unified consent flag. This flag is now
always true.

Bug: 951313
Change-Id: I5a695d0b6c59ba24f1230b8f41b75a491ce6f226
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1784597
Auto-Submit: Jérôme Lebel <jlebel@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693166}