Remove virtual_predicate deprecations. (quantumlib#5724)

Author: MichaelBroughton

Diff for: cirq/devices/noise_properties.py

@@ -22,7 +22,7 @@
 import abc
 from typing import Iterable, Sequence, TYPE_CHECKING, List
 
-from cirq import _compat, _import, ops, protocols, devices
+from cirq import _import, ops, protocols, devices
 from cirq.devices.noise_utils import PHYSICAL_GATE_TAG
 
 circuits = _import.LazyLoader("circuits", globals(), "cirq.circuits.circuit")
@@ -66,10 +66,6 @@ def is_virtual(self, op: 'cirq.Operation') -> bool:
         """
         return False
 
-    @_compat.deprecated(deadline='v0.16', fix='Use is_virtual instead.')
-    def virtual_predicate(self, op: 'cirq.Operation') -> bool:
-        return self.is_virtual(op)
-
     def noisy_moments(
         self, moments: Iterable['cirq.Moment'], system_qubits: Sequence['cirq.Qid']
     ) -> Sequence['cirq.OP_TREE']:

Diff for: cirq/devices/noise_properties_test.py

@@ -54,11 +54,3 @@ def test_sample_model():
         cirq.Moment(cirq.H(q0), cirq.H(q1)),
     )
     assert noisy_circuit == expected_circuit
-
-
-def test_deprecated_virtual_predicate():
-    q0, q1 = cirq.LineQubit.range(2)
-    props = SampleNoiseProperties([q0, q1], [(q0, q1), (q1, q0)])
-    model = NoiseModelFromNoiseProperties(props)
-    with cirq.testing.assert_deprecated("Use is_virtual", deadline="v0.16"):
-        _ = model.virtual_predicate(cirq.X(q0))