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

This reverts commit f94c85b13021c83d50109d0feed25cf498f1cfbd.

Reason for revert: Causing app crashes and runtime restarts in tests. See b/181701570 for details.

Change-Id: I2b5f7b80f07f5d8f564acdf20fcdb1e9b5b9da19
6 files changed