Revert "Revert "Revert "Changing GridMigrationTask to use ModelDbController directly"""

This reverts commit 8d9e468dbb30a3a036b314dc599164d540f9c442.

Reason for revert: b/281179368

Change-Id: Ibfc5329f72cdbcb37d01a8bf3dac2ba0724b9faf
18 files changed