thakis 61a90f94b6 clang/win: Fix -Wextra warnings in webrtc.
Fixes one sign mismatch warning, and one "const has no effect and is
ignored" warning.

BUG=chromium:567877

Review URL: https://codereview.webrtc.org/1510233002

Cr-Commit-Position: refs/heads/master@{#10976}
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