Test runs daily, and is failing since 	M73-11554.1.0 / 73.0.3666.0

Test results dashboard view - https://screenshot.googleplex.com/A11j11HJoBb

Looking at the client test debug logs and comparing with successfultest logs, I see no calls to chrome.autotestPrivate.getVisibleNotifications().

Basically self.cr.autotest_ext.ExecuteJavaScript() at 
https://cs.corp.google.com/chromeos_public/src/third_party/autotest/files/client/site_tests/platform_PrintJob/platform_PrintJob.py?l=84
is throwing the exeption

01/10 06:16:32.745 WARNI|              test:0606| The test failed with the following exception
Traceback (most recent call last):
  File "/usr/local/autotest/common_lib/test.py", line 600, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/usr/local/autotest/common_lib/test.py", line 806, in _call_test_function
    raise error.UnhandledTestFail(e)
UnhandledTestFail: Unhandled DevToolsClientConnectionError: ''
Traceback (most recent call last):
  File "/usr/local/autotest/common_lib/test.py", line 800, in _call_test_function
    return func(*args, **dargs)
  File "/usr/local/autotest/common_lib/test.py", line 464, in execute
    postprocess_profiled_run, args, dargs)
  File "/usr/local/autotest/common_lib/test.py", line 371, in _call_run_once
    self.run_once(*args, **dargs)
  File "/usr/local/autotest/tests/platform_PrintJob/platform_PrintJob.py", line 169, in run_once
    self.execute_print_job()
  File "/usr/local/autotest/tests/platform_PrintJob/platform_PrintJob.py", line 116, in execute_print_job
    self._check_printer_in_dialog()
  File "/usr/local/autotest/tests/platform_PrintJob/platform_PrintJob.py", line 84, in _check_printer_in_dialog
    self.cr.autotest_ext.ExecuteJavaScript(
  File "/usr/local/autotest/common_lib/cros/chrome.py", line 237, in autotest_ext
    return self.get_extension(self._autotest_ext_path)
  File "/usr/local/autotest/common_lib/cros/chrome.py", line 230, in get_extension
    return self.browser.extensions[ext]
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/browser/extension_dict.py", line 19, in __getitem__
    return self.GetByExtensionId(load_extension.extension_id)[0]
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/browser/extension_dict.py", line 34, in GetByExtensionId
    return self._extension_backend[extension_id]
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/extension_backend.py", line 31, in __getitem__
    for context_id in self._extension_backend_list.IterContextIds():
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend_list.py", line 85, in IterContextIds
    self._Update()
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend_list.py", line 98, in _Update
    backends_map = self._devtools_client.GetUpdatedInspectableContexts()
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/devtools_client_backend.py", line 403, in GetUpdatedInspectableContexts
    contexts = self._ListInspectableContexts()
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/devtools_client_backend.py", line 328, in _ListInspectableContexts
    return self._devtools_http.RequestJson('')
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/devtools_http.py", line 107, in RequestJson
    return json.loads(self.Request(path, timeout))
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/devtools_http.py", line 88, in Request
    response = self._conn.getresponse()
  File "/usr/local/lib64/python2.7/httplib.py", line 1132, in getresponse
    response.begin()
  File "/usr/local/lib64/python2.7/httplib.py", line 453, in begin
    version, status, reason = self._read_status()
  File "/usr/local/lib64/python2.7/httplib.py", line 417, in _read_status
    raise BadStatusLine(line)
DevToolsClientConnectionError: ''


ChromeDiff to be examined for causing the failure change - https://chromium.googlesource.com/chromium/src/+log/73.0.3664.0..73.0.3666.0?n=10000