Revert "Add onDataRatChanged trigger to DcTracker"

This reverts commit 87c46aad31de8d1a621584d3f9d37d5636f20f70.

Change-Id: I0b24d22f12d8f148b1f22fcf120f985d0bb0982b
Merge "Revert "Add onDataRatChanged trigger to DcTracker"" into jb-mr2