Remove dependecy on win32.h in criticalsection.h. This was causing build errors that we haven't fully figured out yet but somehow this caused override files to include the files they're supposed to override, which in turn included webrtc build files that then conflict with Chromium's configuration.
Remove dependecy on win32.h in criticalsection.h. This was causing build errors that we haven't fully figured out yet but somehow this caused override files to include the files they're supposed to override, which in turn included webrtc build files that then conflict with Chromium's configuration.

TBR=magjed@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/45479004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#8601}
git-svn-id: 917f5d3ca488f358c4d40eaec14422cf392ccec9@8601 4adac7df-926f-26a2-2b94-8c16560cd09d

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