tests.unit.aiplatform.test_cloud_profiler.TestWebServer: test_correct_response failed

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---

commit: d0d719c0bf557b908eb63f3a245db2f47b136eb3
buildURL: [Build Status](https://source.cloud.google.com/results/invocations/7c6cbad4-1036-43cc-8ecc-27b332d36606), [Sponge](http://sponge2/7c6cbad4-1036-43cc-8ecc-27b332d36606)
status: failed
<details><summary>Test output</summary><br><pre>self = <test_cloud_profiler.TestWebServer testMethod=test_correct_response>

    def test_correct_response(self):
        res_dict = {"response": "OK"}
    
        def my_callable(var1, var2):
            return wrappers.BaseResponse(
                json.dumps(res_dict), content_type="application/json", status=200
            )
    
        plugin = _create_mock_plugin()
        plugin.get_routes.return_value = {"/my_route": my_callable}
        ws = webserver.WebServer([plugin])
    
        builder = EnvironBuilder(method="GET", path="/test_plugin/my_route")
    
        env = builder.get_environ()
    
        # Mock a start response callable
        response = []
        buff = []
    
        def start_response(status, headers):
            response[:] = [status, headers]
            return buff.append
    
>       res = ws(env, start_response)

tests/unit/aiplatform/test_cloud_profiler.py:353: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
google/cloud/aiplatform/training_utils/cloud_profiler/webserver.py:114: in __call__
    return self.wsgi_app(environ, start_response)
google/cloud/aiplatform/training_utils/cloud_profiler/webserver.py:99: in wsgi_app
    response = self.dispatch_request(environ, start_response)
google/cloud/aiplatform/training_utils/cloud_profiler/webserver.py:80: in dispatch_request
    return self._routes[request.path](environ, start_response)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

var1 = {'HTTP_HOST': 'localhost', 'PATH_INFO': '/test_plugin/my_route', 'QUERY_STRING': '', 'RAW_URI': '/test_plugin/my_route', ...}
var2 = <function TestWebServer.test_correct_response.<locals>.start_response at 0x7f7ecd75d4c0>

    def my_callable(var1, var2):
>       return wrappers.BaseResponse(
            json.dumps(res_dict), content_type="application/json", status=200
        )
E       AttributeError: module 'werkzeug.wrappers' has no attribute 'BaseResponse'

tests/unit/aiplatform/test_cloud_profiler.py:333: AttributeError</pre></details>

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