One of the unit tests added in https://webrtc-codereview.appspot.com/50079004/ is failing on Windows since os.sep is a backslash on Windows. The code is based on the contents of the DEPS file rather than the filesystem, so the right thing is to use '/' instead of os.sep. The PyLint blacklist also didn't work on Windows, causing it to process a massive list of files during presubmit. I also added a bunch of new entries to speed up lint execution on all platforms. TESTED=Ran the presubmit with this CL on Windows and Linux. R=phoglund@webrtc.org Review URL: https://webrtc-codereview.appspot.com/52029004 Cr-Commit-Position: refs/heads/master@{#9353}