Fix stats hud in AppRTC Demo for iOS.
Fix stats hud in AppRTC Demo for iOS.

NOTRY=true

Review-Url: https://codereview.webrtc.org/2034033002
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#13290}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: ff4def7eb7a747591bf31a724e967064e27b5d63

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