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This CL prepares for the introduction of the new page, in order to make
the diff smaller when the page functionality is actually added. It adds
the necessary strings, the new '/device' route and the settings-subpage
component where the new page will be injected.

The route only exists for users with the kEnablePasswordsAccountStorage
feature enabled. The page is not searchable from settings. This is to
avoid users who are not eligible/opted-in to b4p accessing it by
mistake. The page can still be accessed by those users if they type the
URL on the omnibar, as happens for other pages in Settings.

Bug: 1049141
Change-Id: I726549953b28abf9da0d764629d0fab529d9b877
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2228618
Commit-Queue: Victor Vianna <victorvianna@google.com>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774848}