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This CL sets up the new design of the security page info, creating the
flag and the files needed.

- The existing PageInfoVC is renamed LegacyPageInfoViewController
- A new PageInfoViewController is created
- A new PageInfoCoordinator is created
- A features file is created (with the feature inside)
- BrowserCoordinator is instantiating the old/new coordinator based
  on the feature
- The call to display PageInfo depends on the feature state

Bug: 1038919
Change-Id: Ia42620e99c0343a7ee8bdc5838145aa9c5ed4f9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1986825
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Auto-Submit: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728592}