Revert "Use activities' own animations, unless opaque activity on top"

This reverts commit 4954baec61ad6217aa02948f70d4f643d4ef06a2.

Reason for revert: Obsolete, replaced by ag/29184852

Change-Id: I1d351cf2a11d66ef5f73e6a6246f7bbc78af8678
2 files changed