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Its expiration dates from M77.

Also, the CL removes the enum class and the aura::Window
property associated solely with populating this histogram:

- chromeos::ImmersiveFullscreenController::WindowType
- chromeos::kImmersiveWindowType

BUG=1113900, 1138662
R=chromium-metrics-reviews@google.com, jamescook@chromium.org, sky@chromium.org

Change-Id: Ib4345da71a21f67f45ffeb4fd68cb8e168552bcd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2476916
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818241}