Remove obsolete comment about Weaver deadlock

The explanation of why the deadlock should not occur turned out be
incorrect.  Therefore the deadlock had to be fixed, and this was done by
https://r.android.com/3291561.  Remove the obsolete part of the comment.

Change-Id: I08b29d5783ac75d6ac9c135d62f7d50c6e27c855
1 file changed