Revert "Read from BufferReleaseChannel in background thread"

This reverts commit 5ab65e9ef047bc802885396f0e1d960901e86a5c.

Reason for revert: Droidmonitor created revert due to b/362800004. Will be verifying through ABTD before submission.

Change-Id: I440606b3da7f4d4c85f5900ac9b9e6fb18ccd8fa
7 files changed