The Win7 debug (ATI) bot is consistently failing the bot update step.

Build log:
https://build.chromium.org/p/chromium.gpu.fyi/builders/Win7%20Debug%20%28ATI%29/builds/1924

Output:
===Running gclient.bat sync --verbose --reset --force --ignore_locks --output-json c:\users\chrome~2\appdata\local\temp\tmpah3xmp.json --nohooks --noprehooks --delete_unversioned_trees (attempt #1)===
In directory: E:\b\build\slave\Win7_Debug__ATI_\build
Could Not Find e:\b\build\slave\cache_dir\chromium.googlesource.com-external-libaddressinput.lock
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Could Not Find e:\b\build\slave\cache_dir\chromium.googlesource.com-external-pyftpdlib.lock
Could Not Find e:\b\build\slave\cache_dir\chromium.googlesource.com-external-libphonenumber-cpp-test.lock
Could Not Find e:\b\build\slave\cache_dir\chromium.googlesource.com-v8-v8.lock
Could Not Find e:\b\build\slave\cache_dir\chromium.googlesource.com-chromium-deps-libsrtp.lock
Could Not Find e:\b\build\slave\cache_dir\chromium.googlesource.com-external-googlemock.lock
Could Not Find e:\b\build\slave\cache_dir\chromium.googlesource.com-chromium-deps-opus.lock
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Could Not Find e:\b\build\slave\cache_dir\chromium.googlesource.com-external-github.com-chromium-web--page--replay.lock
Could Not Find e:\b\build\slave\cache_dir\chromium.googlesource.com-webm-libwebm.lock
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Could Not Find e:\b\build\slave\cache_dir\android.googlesource.com-platform-external-deqp.lock
Could Not Find e:\b\build\slave\cache_dir\chromium.googlesource.com-external-libphonenumber.lock
Could Not Find e:\b\build\slave\cache_dir\chromium.googlesource.com-chromium-llvm--project-libcxxabi.lock
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