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SigninViewController::ShowReauthPopup() will start showing a popup
window with a reauth page if "SigninReauthPrompt" feature is enabled.

This popup observes all navigations and reports success once a special
reauth endpoint is successfully loaded. This endpoint is currently
available only on test Gaia.

The behavior of ShowReauthPopup() without the feature flag also has
changed. Now Chrome will display a fake reauth dialog by default.
ShowReauthPopup() is still in development and shouldn't be used without
a flag anyways. There is no need to guard it behind another feature
flag.

The screen recording of the resulting flow is available at
https://screencast.googleplex.com/cast/NTM5Njc2MjgxNjY3NTg0MHw0MTg2MGQ0OS02Yg

Bug: 1045515
Change-Id: I8a685b593dadec3ec059c77a6a4eccb946f4c98c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2107840
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751342}