Revert "Prefetching can be interupted by other service requests."

This reverts commit 103dd32a74f9962e41499b4a39b15b32e963ce65.

Reason for revert: Looking for culprits for b/176078134

Change-Id: I1e2524411fcc91a2c212d4ee5a0f5b74cac0bda4
5 files changed