Revert "Log event when dragging bubble bar left or right"

This reverts commit 45180f04.

Reason for revert: DroidMonitor: Potential culprit for http://b/377364782 - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Change-Id: I8839058d250d4907043ac0f7d0145a118ae5b097