Passing cancel signal to Core for Unary Call as well

src/python/grpcio/grpc/_cython/_cygrpc/aio/call.pyx.pxi

@@ -77,11 +77,6 @@ cdef class _AioCall:
         """Destroys the corresponding Core object for this RPC."""
         grpc_call_unref(self._grpc_call_wrapper.call)
 
-    @property
-    def locally_cancelled(self):
-        """Grant Python layer access of the cancelled flag."""
-        return self._is_locally_cancelled
-
     def cancel(self, AioRpcStatus status):
         """Cancels the RPC in Core with given RPC status.
         
@@ -112,12 +107,6 @@ cdef class _AioCall:
             # By implementation, grpc_call_cancel always return OK
             error = grpc_call_cancel(self._grpc_call_wrapper.call, NULL)
             assert error == GRPC_CALL_OK
-            status = AioRpcStatus(
-                StatusCode.cancelled,
-                _UNKNOWN_CANCELLATION_DETAILS,
-                None,
-                None,
-            )
 
     async def unary_unary(self,
                           bytes request,

src/python/grpcio/grpc/experimental/aio/_call.py

@@ -297,6 +297,7 @@ class UnaryUnaryCall(Call, _base_call.UnaryUnaryCall):
         """Forwards the application cancellation reasoning."""
         if not self._status.done():
             self._set_status(status)
+            self._cython_call.cancel(status)
             self._call.cancel()
             return True
         else: