Use chrono for timing
Summary: Since we depend on C++11, we might as well use it for timing, instead of this platform-depended code. Test Plan: Ran autovector_test, which reports time and confirmed that output is similar to master Reviewers: ljin, sdong, yhchiang, rven, dhruba Reviewed By: dhruba Subscribers: dhruba, leveldb Differential Revision: https://reviews.facebook.net/D25587
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