The detailed error log is as follows.
Traceback (most recent call last):
  File "/usr/local/autotest/common_lib/test.py", line 831, in _call_test_function
    return func(*args, **dargs)
  File "/usr/local/autotest/common_lib/test.py", line 495, in execute
    dargs)
  File "/usr/local/autotest/common_lib/test.py", line 362, in _call_run_once_with_retry
    postprocess_profiled_run, args, dargs)
  File "/usr/local/autotest/common_lib/test.py", line 400, in _call_run_once
    self.run_once(*args, **dargs)
  File "/usr/local/autotest/cros/video/helper_logger.py", line 82, in call
    return func(*args, **kwargs)
  File "/usr/local/autotest/tests/video_VideoSanity/video_VideoSanity.py", line 57, in run_once
    init_network_controller=True) as cr:
  File "/usr/local/autotest/common_lib/cros/chrome.py", line 171, in __init__
    self._browser = browser_to_create.Create(finder_options)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_finder.py", line 51, in Create
    browser_backend, self._platform_backend)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_with_oobe.py", line 14, in __init__
    backend, platform_backend)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/browser/browser.py", line 41, in __init__
    self._browser_backend.Start()
  File "/usr/local/telemetry/src/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 52, in traced_function
    return func(*args, **kwargs)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_backend.py", line 202, in Start
    self._WaitForLogin()
  File "/usr/local/telemetry/src/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 52, in traced_function
    return func(*args, **kwargs)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_backend.py", line 312, in _WaitForLogin
    py_utils.WaitFor(self._IsLoggedIn, 900)
  File "/usr/local/telemetry/src/third_party/catapult/common/py_utils/py_utils/__init__.py", line 129, in WaitFor
    res = condition()
  File "/usr/local/telemetry/src/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 52, in traced_function
    return func(*args, **kwargs)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_backend.py", line 308, in _IsLoggedIn
    return not self._GetLoginStatus()
  File "/usr/local/telemetry/src/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 52, in traced_function
    return func(*args, **kwargs)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_backend.py", line 299, in _GetLoginStatus
    if not self.HasBrowserFinishedLaunching():
AttributeError: 'CrOSBrowserBackend' object has no attribute 'HasBrowserFinishedLaunching'

Hm, looks like telemetry unit tests are failing as well:
https://build.chromium.org/p/chromiumos.chromium/builders/amd64-generic-telemetry

Possibly the catapult roll in the first failing amd64-generic-telemetry build?
https://chromium-review.googlesource.com/c/chromium/src/+/836694

Ah, yes, this change description indicates that HasBrowserFinishedLaunching is relpaced with HasDevToolsConnection:
https://chromium.googlesource.com/catapult.git/+/a586b0072a208470e55680d2d6f097e5b7c674ff%5E%21/#F2

I commented on the CL where it's missing the API call change. I'll see if I can git clone the repo and fix it.
https://chromium-review.googlesource.com/c/catapult/+/833925

Looks like it's been fixed in the catapult repo already:

commit 436908b7d264b36cf00478756f59f109e93e31a5
Author: Juan Antonio Navarro Perez <perezju@google.com>
Date:   Thu Dec 21 09:01:28 2017 +0000

    [Telemetry] Fix cros_browser_backend
    
    The HasBrowserFinishedLaunching method was removed at:
    https://chromium-review.googlesource.com/c/catapult/+/833925
    
    But a reference to it remained in the cros_browser_backend;
    replacing that with the new HasDevToolsConnection instead.
    
    TBR=nednguyen@google.com,achuith@chromium.org
    Bug:  chromium:787834 
    Change-Id: I4b21427bd8bbb08f4e6d96ce05060b163961a77d
    Reviewed-on: https://chromium-review.googlesource.com/839140
    Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
    Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>

Fix rolled into chromium/src 14 hours ago:
https://chromium-review.googlesource.com/c/chromium/src/+/839541

Yes, sorry for the trouble caused by my CL! Do you think the issue is fixed now? Or are we seeing new failures?