ALL of the windows tryservers are failing ALL builds on a git issue:

https://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_ng/builds/350385
https://build.chromium.org/p/tryserver.chromium.win/builders/win_optional_gpu_tests_rel/builds/6033
https://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_rel_ng/builds/334991
https://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_compile_dbg_ng/builds/315190
https://build.chromium.org/p/tryserver.chromium.win/builders/win_clang/builds/139096

INFO:root:running ['E:\\b\\rr\\tmp21sx3f\\rw\\checkout\\scripts\\slave\\.recipe_deps\\depot_tools\\cipd.bat', 'ensure', '-list', 'c:\\users\\chrome~2\\appdata\\local\\temp\\tmpt7qmpj', '-root', 'c:\\users\\chrome~2\\appdata\\local\\temp\\tmpizx4tr', '-verbose']
Exception calling "Invoke" with "0" argument(s): "A parameter cannot be found t
hat matches parameter name 'First'."
At E:\b\rr\tmp21sx3f\rw\checkout\scripts\slave\.recipe_deps\depot_tools\cipd.ps
1:11 char:29
+     return $defaultFn.Invoke <<<< ()
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : CatchFromBaseAdapterMethodInvoke
 
Bootstrapping cipd client for windows-386...
From https://chrome-infra-packages.appspot.com/client?platform=windows-386&vers
ion=
Exception calling "DownloadFile" with "2" argument(s): "The remote server retur
ned an error: (400) Bad Request."
At E:\b\rr\tmp21sx3f\rw\checkout\scripts\slave\.recipe_deps\depot_tools\cipd.ps
1:47 char:21
+     $wc.DownloadFile <<<< ($url, $client)
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : DotNetMethodException
 
The term 'E:\b\rr\tmp21sx3f\rw\checkout\scripts\slave\.recipe_deps\depot_tools\
.cipd_client.exe' is not recognized as the name of a cmdlet, function, script f
ile, or operable program. Check the spelling of the name, or if a path was incl
uded, verify that the path is correct and try again.
At E:\b\rr\tmp21sx3f\rw\checkout\scripts\slave\.recipe_deps\depot_tools\cipd.ps
1:50 char:7
+ $_ = & <<<<  $client selfupdate -version "$cipdClientVer"
    + CategoryInfo          : ObjectNotFound: (E:\b\rr\tmp21sx...cipd_client.e 
   xe:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException
 
The term 'E:\b\rr\tmp21sx3f\rw\checkout\scripts\slave\.recipe_deps\depot_tools\
.cipd_client.exe' is not recognized as the name of a cmdlet, function, script f
ile, or operable program. Check the spelling of the name, or if a path was incl
uded, verify that the path is correct and try again.
At E:\b\rr\tmp21sx3f\rw\checkout\scripts\slave\.recipe_deps\depot_tools\cipd.ps
1:56 char:2
+ & <<<<  $client @args
    + CategoryInfo          : ObjectNotFound: (E:\b\rr\tmp21sx...cipd_client.e 
   xe:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException
 
INFO:root:running 'c:\\users\\chrome~2\\appdata\\local\\temp\\tmpizx4tr\\git-installer.exe -y -InstallPath="E:\\\\b\\\\rr\\\\tmp21sx3f\\\\rw\\\\checkout\\\\scripts\\\\slave\\\\.recipe_deps\\\\depot_tools\\\\git-2.10.0-64_bin" -Directory="E:\\\\b\\\\rr\\\\tmp21sx3f\\\\rw\\\\checkout\\\\scripts\\\\slave\\\\.recipe_deps\\\\depot_tools\\\\git-2.10.0-64_bin"'
Traceback (most recent call last):
  File "E:\b\rr\tmp21sx3f\rw\checkout\scripts\slave\.recipe_deps\depot_tools\bootstrap\win\git_bootstrap.py", line 193, in <module>
    sys.exit(main(sys.argv[1:]))
  File "E:\b\rr\tmp21sx3f\rw\checkout\scripts\slave\.recipe_deps\depot_tools\bootstrap\win\git_bootstrap.py", line 185, in main
    install_git(args, git_version, git_directory)
  File "E:\b\rr\tmp21sx3f\rw\checkout\scripts\slave\.recipe_deps\depot_tools\bootstrap\win\git_bootstrap.py", line 115, in install_git
    '-Directory="%s"' % git_directory.replace('\\', '\\\\'),
  File "E:\b\rr\tmp21sx3f\rw\checkout\scripts\slave\.recipe_deps\depot_tools\bootstrap\win\git_bootstrap.py", line 26, in _check_call
    subprocess.check_call(argv, **kwargs)
  File "E:\b\depot_tools\python276_bin\lib\subprocess.py", line 535, in check_call
    retcode = call(*popenargs, **kwargs)
  File "E:\b\depot_tools\python276_bin\lib\subprocess.py", line 522, in call
    return Popen(*popenargs, **kwargs).wait()
  File "E:\b\depot_tools\python276_bin\lib\subprocess.py", line 709, in __init__
    errread, errwrite)
  File "E:\b\depot_tools\python276_bin\lib\subprocess.py", line 957, in _execute_child
    startupinfo)
WindowsError: [Error 2] The system cannot find the file specified