7f6c4d42a2605d1da39af3f957a46cf57b043b84

Mostly this consists of marking functions with override when applicable, and moving function bodies from .h to .cc files. BUG=163 R=henrik.lundin@webrtc.org Review URL: https://webrtc-codereview.appspot.com/44109004 Cr-Commit-Position: refs/heads/master@{#8960}
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