This test has failed often in the last couple of days:

https://uberchromegw.corp.google.com/i/chromium.win/builders/Win7%20Tests%20%28dbg%29%281%29

https://uberchromegw.corp.google.com/i/chromium.win/builders/Win7%20Tests%20%28dbg%29%281%29/builds/64528
https://uberchromegw.corp.google.com/i/chromium.win/builders/Win7%20Tests%20%28dbg%29%281%29/builds/64527
https://uberchromegw.corp.google.com/i/chromium.win/builders/Win7%20Tests%20%28dbg%29%281%29/builds/64524
https://uberchromegw.corp.google.com/i/chromium.win/builders/Win7%20Tests%20%28dbg%29%281%29/builds/64521


A section of output from the most recent:

[556/566] telemetry.internal.browser.browser_unittest.TestBrowserOperationDoNotLeakTempFiles.testBrowserNotLeakingTempFiles failed unexpectedly 4.4960s:
  Chrome build location for win_AMD64 not found. Browser will be run without Flash.
  Tsproxy commandline: ['c:\\infra-system\\bin\\python.exe', 'e:\\b\\s\\w\\ir\\third_party\\catapult\\telemetry\\third_party\\tsproxy\\tsproxy.py', '--port=0', '--desthost=127.0.0.1']
  TsProxy port: 56079
  Requested remote debugging port: 0
  Starting Chrome ['../../out\\Debug\\chrome.exe', '--enable-net-benchmarking', '--metrics-recording-only', '--no-default-browser-check', '--no-first-run', '--enable-gpu-benchmarking', '--disable-background-networking', '--proxy-server=socks://localhost:56079', '--ignore-certificate-errors-spki-list=PhrPvGIaAMmd29hj8BCZOq096yj7uMpRNHpn5PDxI6I=', '--disable-component-extensions-with-background-pages', '--disable-default-apps', '--disable-search-geolocation-disclosure', '--remote-debugging-port=0', '--enable-crash-reporter-for-testing', '--disable-component-update', '--window-size=1280,1024', '--user-data-dir=e:\\b\\s\\w\\itowg_ck\\tmpiq_s4x', 'about:blank']
  Discovered ephemeral port 56081
  Browser target: /devtools/browser/f3996101-faf5-454e-9bef-996cc692cd98
  Browser started (pid=4224).
  OS: win win7
  Detailed OS version: 6.1.7601
  Browser command line: "../../out\Debug\chrome.exe" --enable-net-benchmarking --metrics-recording-only --no-default-browser-check --no-first-run --enable-gpu-benchmarking --disable-background-networking --proxy-server=socks://localhost:56079 --ignore-certificate-errors-spki-list=PhrPvGIaAMmd29hj8BCZOq096yj7uMpRNHpn5PDxI6I= --disable-component-extensions-with-background-pages --disable-default-apps --disable-search-geolocation-disclosure --remote-debugging-port=0 --enable-crash-reporter-for-testing --disable-component-update --window-size=1280,1024 --user-data-dir="e:\b\s\w\itowg_ck\tmpiq_s4x" --flag-switches-begin --flag-switches-end about:blank
  GPU device 0: VENDOR = 0x15ad, DEVICE = 0x405
  GPU Attributes:
    amd_switchable      : False
    basic_info_state    : 1
    can_support_threaded_texture_mailbox: False
    context_info_state  : 1
    direct_rendering    : True
    driver_date         : 2017/04/07
    driver_vendor       : Google Inc.
    driver_version      : 3.3.0.2
    dx_diagnostics_info_state: 0
    gl_extensions       : 
    gl_renderer         : Google SwiftShader
    gl_reset_notification_strategy: 0
    gl_vendor           : Google Inc.
    gl_version          : OpenGL ES 2.0 SwiftShader
    gl_ws_extensions    : 
    gl_ws_vendor        : 
    gl_ws_version       : 
    in_process_gpu      : True
    initialization_time : 0
    jpeg_decode_accelerator_supported: False
    max_msaa_samples    : 4
    optimus             : False
    passthrough_cmd_decoder: False
    pixel_shader_version: 3.0
    process_crash_count : 0
    sandboxed           : False
    software_rendering  : True
    supports_overlays   : False
    vertex_shader_version: 3.0
    video_decode_accelerator_flags: 0
  Feature Status:
    2d_canvas           : unavailable_software
    checker_imaging     : enabled_on
    flash_3d            : unavailable_software
    flash_stage3d       : unavailable_software
    flash_stage3d_baseline: unavailable_software
    gpu_compositing     : unavailable_software
    multiple_raster_threads: enabled_on
    native_gpu_memory_buffers: disabled_software
    rasterization       : unavailable_software
    video_decode        : unavailable_software
    video_encode        : unavailable_software
    webgl               : enabled_readback
    webgl2              : unavailable_software
  Closing browser (pid=4224) ...
  Successfully shut down browser cooperatively
  Browser is closed.
  Traceback (most recent call last):
    File "e:\b\s\w\ir\third_party\catapult\telemetry\telemetry\decorators.py", line 208, in wrapper
      func(*args, **kwargs)
    File "e:\b\s\w\ir\third_party\catapult\telemetry\telemetry\internal\browser\browser_unittest.py", line 307, in testBrowserNotLeakingTempFiles
      after_browser_run_temp_dir_content)
  AssertionError: Lists differ: ['luci_ctx.w2srlm.json', 'oaut... != ['luci_ctx.w2srlm.json', 'oaut...
  
  First differing element 24:
  'tmpiwuqtq'
  'tmpiq_s4x'
  
  Second list contains 2 additional elements.
  First extra element 53:
  'tmp_bmr9j'
  
  Diff is 967 characters long. Set self.maxDiff to None to see it.