Revert of "Prevent race conditions between decrypt and close session"

Merge from Widevine repo of http://go/wvgerrit/50481
Original CL http://go/wvgerrit/47520

The original CL was not completely merged to master on Android, so
this CL only reverts the left-over bits.

The original fix was not sufficient to address all race conditions.  A
subsequent CL will address them.

Bug: 73781703
Bug: 79158083
Bug: 79262108
Test: tested as part of http://go/ag/4674759

Change-Id: Ib6c55ab5434e08fe61e0f65623ac8c7b2dc5aaa1

libwvdrmengine/cdm/core/include/wv_cdm_types.h

@@ -333,6 +333,7 @@ enum CdmResponseType {
   GET_PROVISIONING_METHOD_ERROR = 289,
   SESSION_NOT_FOUND_17 = 290,
   SESSION_NOT_FOUND_18 = 291,
+  /* Error code 292 can be reused as it was never present in a release */
   DEVICE_CANNOT_REPROVISION = 293,
   SESSION_NOT_FOUND_19 = 294,
 };