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When detaching the |UiControllerAndroid| this adds a new
|WebContentsObserver| to the current |WebContent|, that triggers the
UI self destruct on navigation.

This can not be handled in the |Controller| as this one gets destroyed
when the |Client| shuts down.

Bug: b/159977785
Change-Id: I88a36278b0f517519286d53f49c2de4486f41e00
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2279978
Commit-Queue: Sandro Maggi <sandromaggi@google.com>
Reviewed-by: Marian Fechete <marianfe@google.com>
Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786237}