Seems more than one browser instance is running. Not sure what happened. Feels like some Telemetry corner case?

https://uberchromegw.corp.google.com/i/chromium.perf/builders/Android%20One%20Perf/builds/626

Traceback (most recent call last):
  File "/b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/story_runner.py", line 97, in _RunStoryAndProcessErrorIfNeeded
    state.WillRunStory(story)
  File "/b/swarming/w/ir/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 75, in traced_function
    return func(*args, **kwargs)
  File "/b/swarming/w/ir/third_party/catapult/telemetry/telemetry/page/shared_page_state.py", line 240, in WillRunStory
    self._StartBrowser(page)
  File "/b/swarming/w/ir/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 75, in traced_function
    return func(*args, **kwargs)
  File "/b/swarming/w/ir/third_party/catapult/telemetry/telemetry/page/shared_page_state.py", line 201, in _StartBrowser
    self._browser = self._possible_browser.Create(self._finder_options)
  File "/b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/backends/chrome/android_browser_finder.py", line 136, in Create
    browser_backend, self._platform_backend, self._credentials_path)
  File "/b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/browser/browser.py", line 60, in __init__
    self._LogBrowserInfo()
  File "/b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/browser/browser.py", line 117, in _LogBrowserInfo
    logging.info('Browser started (pid=%s).', self._browser_backend.pid)
  File "/b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/backends/chrome/android_browser_backend.py", line 236, in pid
    '%s' % (self._backend_settings.package, pids))
Exception: At most one instance of process org.chromium.chrome expected but found pids: defaultdict(<type 'list'>, {'org.chromium.chrome:sandboxed_process0': ['22016'], 'org.chromium.chrome': ['21985', '22067']})

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