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https://crrev.com/c/1020942 meant to make sure |DetachedFromWindow| is
invoked upon ViewAndroid destruction. This had a bug when
WindowAndroid is destroyed first, which can happen for Chromecast
where WebContents destruction is delayed by design.

WindowAndroid dtor invokes |GetWindowAndroid| indirectly via its
base dtor (through RemoveAllChildren), but it didn't work as intended
because |GetWindowAndroid| is a virtual function. So it ended up
calling |ViewAndroid::GetWindowAndroid|, not
|WindowAndroid::GetWindowAndroid|.

This CL fixes it by pulling out the task of invoking
|OnDetachedFromWindow| so that the destructor won't use the virtual
function. WindowAndroid can call |OnDetachedFromWindow| in its dtor
since it doesn't need |GetWindowAndroid| - it knows for sure
WindowAndroid (itself) is present.


Bug: b/78251221
Change-Id: I754e45ca3ea61ceb86101ede3b529e75e206689f
Reviewed-on: https://chromium-review.googlesource.com/1102823
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568064}