Fix compiler warnings due to type mismatch.

BUG=webrtc:8169

Change-Id: Ie98dcaa09e1e5b7c9f48410cd3049740ccac67b9
Reviewed-on: https://chromium-review.googlesource.com/639314
Reviewed-by: Niklas Enbom <niklas.enbom@webrtc.org>
Commit-Queue: Lu Liu <lliuu@webrtc.org>
Cr-Original-Commit-Position: refs/heads/master@{#19567}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: ff2824b917f6a01473bd4c7c2a201defe3c261a5
2 files changed