Remove optimization to isInContentArea that wasn't working.

Remove optimization to isInContentArea that wasn't working.

This might fix the bug where tapping outside the notification panel doesn't close it.

I'm not 100% sure because I can't reproduce this on-demand, but I think it's possible for
onSizeChanged to race with the animations and we end up with a bad rectangle.  The time
I did see it happen was tapping above the title area right after canceling a notification,
so that could explain it I think.

Bug: 3339023
Change-Id: Ic3a7f4c059e7bf6f30b864a371a0912a6414edb7