Reverts 58fbb8a

PiperOrigin-RevId: 845733949

Author: gnecula

tests/export_back_compat_test.py

@@ -813,7 +813,7 @@ def func(x):  # b: f32[2, 4]
     # the expected custom call targets for old test data that was serialized
     # with custom calls.
     for data, custom_call_targets_override in data:
-      with jax.set_mesh(mesh):
+      with mesh:
         if jax.config.jax_use_shardy_partitioner:
           self.run_one_test(
               func, self.load_testdata(data["shardy"]),
@@ -1040,7 +1040,7 @@ def shard_map_func(x):  # b: f32[2, 4]
     # the expected custom call targets for old test data that was serialized
     # with custom calls.
     for data, custom_call_targets_override in data:
-      with jax.set_mesh(Mesh(devices, axis_names=('x'))):
+      with Mesh(devices, axis_names=('x')):
         self.run_one_test(
             func, self.load_testdata(data),
             expect_current_custom_calls=custom_call_targets_override)