Implement nsec() correctly for Windows.
Implement nsec() correctly for Windows.

Fixes #55.

Change-Id: I392e403fc6c099ee1255cd2af4e2355722af4e01
Reviewed-on: https://code-review.googlesource.com/3551
Reviewed-by: Paul Wankadia <62d4e38bb1380f055ec4b899baa75e52af09c5f7@google.com>

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