Revert "Handle not having main window in createThumbnailAppAnimator."

This reverts commit 6db4d15d726b8830ad56766352a79fe0417cb9c2.

Bug:62096254
Reason for revert: Breaking the build due to test references to class

Change-Id: I6021c802d04a3a55a19f54fc94389957c8152ed9
1 file changed