The test is flaky on try bots. Got hit a couple of times today.

e.g.
https://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_chromeos_ozone_rel_ng/builds/411808
https://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_chromeos_ozone_rel_ng/builds/411926

and one more:
https://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_chromeos_ozone_rel_ng/builds/411964

This is one sample log that has some JS error. (The other two are not very informative).
[ RUN      ] EnterpriseEnrollmentTest.TestActiveDirectoryEnrollment_Success
HTTPS server started on 127.0.0.1:44321...
sending server_data: {"host": "127.0.0.1", "port": 44321} (36 bytes)
[10770:10853:0621/112126.618966:WARNING:freezer_cgroup_process_manager.cc(61)] Cgroup freezer does not exist or is not writable. Unable to freeze renderer processes.
[10770:10770:0621/112127.246980:WARNING:CONSOLE(0)] "Styling master document from stylesheets defined in HTML Imports is deprecated, and is planned to be removed in M65, around March 2018. Please refer to https://goo.gl/EGXzpw for possible migration paths.", source:  (0)
[10770:10770:0621/112127.415680:WARNING:CONSOLE(1)] "This file is deprecated. Please use `iron-flex-layout/iron-flex-layout-classes.html`, and one of the specific dom-modules instead", source: chrome://resources/polymer/v1_0/iron-flex-layout/classes/iron-shadow-flex-layout-extracted.js (1)
[10770:10770:0621/112127.435139:WARNING:CONSOLE(1)] "This file is deprecated. Please use `iron-flex-layout/iron-flex-layout-classes.html`, and one of the specific dom-modules instead", source: chrome://resources/polymer/v1_0/iron-flex-layout/classes/iron-flex-layout-extracted.js (1)
[10770:10770:0621/112129.006062:WARNING:CONSOLE(3866)] "/deep/ combinator is no longer supported in CSS dynamic profile. It is now effectively no-op, acting as if it were a descendant combinator. You should consider to remove it. See https://www.chromestatus.com/features/4964279606312960 for more details.", source: chrome://resources/polymer/v1_0/polymer/polymer-extracted.js (3866)
[10770:10770:0621/112129.598452:ERROR:device_event_log_impl.cc(156)] [11:21:29.598] Network: network_state_handler.cc:160 SetTechnologyEnabled() called for the Tether DeviceState, but the current state was: 0
[10770:10770:0621/112129.605748:INFO:CONSOLE(8123)] "Loading asset bundle oauth-enrollment", source: chrome://oobe/oobe.js (8123)
[10770:10770:0621/112130.749242:INFO:CONSOLE(8107)] "Finished loading asset bundle oauth-enrollment", source: chrome://oobe/oobe.js (8107)
[10770:10770:0621/112130.804492:ERROR:CONSOLE(8640)] "TypeError: Cannot read property 'apply' of undefined
    at Object.api.(anonymous function) [as showStep] (chrome://oobe/oobe.js:416:42)
    at <anonymous>:1:29", source: chrome://oobe/oobe.js (8640)
[10770:10770:0621/112130.804685:ERROR:CONSOLE(416)] "Uncaught TypeError: Cannot read property 'apply' of undefined", source: chrome://oobe/oobe.js (416)
[10770:10770:0621/112130.843498:WARNING:enrollment_screen_handler.cc(442)] EnrollmentScreenHandler::UpdateState(): state=online, reason=update
[10770:10902:0621/112131.126698:WARNING:fake_gaia.cc(318)] Serving request /embedded/setup/chromeos
127.0.0.1 - - [21/Jun/2017 11:21:31] "GET /embedded/setup/chromeos?client_id=dummytoken&flow=enterprise HTTP/1.1" 200 -
[10770:10770:0621/112131.242971:WARNING:enrollment_screen.cc(295)] Device is successfully enrolled.
[10770:10770:0621/112131.243041:WARNING:enrollment_screen.cc(318)] The device attribute update is not permitted
../../chrome/browser/chromeos/login/enterprise_enrollment_browsertest.cc:341: Failure
Value of: IsStepDisplayed("success")
  Actual: false
Expected: true
../../chrome/browser/chromeos/login/enterprise_enrollment_browsertest.cc:342: Failure
Value of: IsStepDisplayed("error")
  Actual: true
Expected: false
[10770:10902:0621/112131.368379:ERROR:fake_gaia.cc(321)] Unhandled request /favicon.ico
[10770:10902:0621/112131.368466:WARNING:embedded_test_server.cc(219)] Request not handled. Returning 404: /favicon.ico
127.0.0.1 - - [21/Jun/2017 11:21:31] "GET /favicon.ico HTTP/1.1" 404 -
[  FAILED  ] EnterpriseEnrollmentTest.TestActiveDirectoryEnrollment_Success, where TypeParam =  and GetParam() =  (5511 ms)

Picked JS error from above log (not sure whether it is the root cause tho since the other two fails without it):

[10770:10770:0621/112130.804492:ERROR:CONSOLE(8640)] "TypeError: Cannot read property 'apply' of undefined
    at Object.api.(anonymous function) [as showStep] (chrome://oobe/oobe.js:416:42)
    at <anonymous>:1:29", source: chrome://oobe/oobe.js (8640)
[10770:10770:0621/112130.804685:ERROR:CONSOLE(416)] "Uncaught TypeError: Cannot read property 'apply' of undefined", source: chrome://oobe/oobe.js (416)

Probably triggered from SetupActiveDirectoryJSNotifications in the test:
https://cs.chromium.org/chromium/src/chrome/browser/chromeos/login/enterprise_enrollment_browsertest.cc?rcl=fcd8fc688cf09e9a5cb2717d4fb8402c9f356edf&l=167