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_basename_re and _checked_in_header_re were too large to work on Windows
Python. Split them into small chunks.

Bug: 767672
Change-Id: Ic283face324253a6d3104067237e1f41244375cf
Reviewed-on: https://chromium-review.googlesource.com/997198Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548640}