GitLab

This is a followup to crrev.com/595106, realizing that there are ~80
more lines to change.

The same (anti)pattern is found in:
shell> git grep '\\\\\\/' -- '*.py'  # my job is counting slashes
  android_webview/support_library/PRESUBMIT.py
  mojo/PRESUBMIT.py
  native_client_sdk/PRESUBMIT.py
  third_party/blink/PRESUBMIT.py
  third_party/blink/renderer/bindings/PRESUBMIT.py

Not updating these files now because:
1. lazy
2. allowing the world where this might break
3. will shoot those at different OWNERS

Bug: None
Change-Id: Ib9d9209098147fa9a36bb179a138b625ad2ff3d6
Reviewed-on: https://chromium-review.googlesource.com/1251629Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: Egor Pasko <pasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595178}