Revert "Use GestureDetector in WorkspaceTouchListener"

This reverts commit 7c8fb786fa529c76fc88b8b24dec2d39e225546b.

Reason for revert: Chatted with Sunny, the concern was brought up that this is risky and will create potential for dogfood confusion with the new gesture navigation that is getting rolled out soon. So we can try to reland this in a few weeks.

Change-Id: I4f09cc9982164195dc42cd6e4714ede767cce786
1 file changed