Fix logic for warningsAsErrors warningsAsErrors should be falsed on Windows 7 because we may legitimately get a warning about loading the old d3dcompiler DLL on that platform. The logic for this was reversed in the initial change. This change flips the logic, changes the cutoff OS version, and always sets the flag to something. Bug: chromium:920704 Change-Id: Ibf8a7c9a48bffc183479b7614148d6c00c122a07 Reviewed-on: https://chromium-review.googlesource.com/c/1496015 Commit-Queue: Bruce Dawson <brucedawson@chromium.org> Reviewed-by: Jamie Madill <jmadill@google.com>