Make CanSetupVideoCallWith4To3AspectRatio use VGA.
Make CanSetupVideoCallWith4To3AspectRatio use VGA.

A pending change makes libvpx at 300k start at VGA resolution and then
go up from there. This test expected >VGA resolutions for initial
frames, which would no longer remain true.

BUG=webrtc:5678
R=perkj@chromium.org

Review URL: https://codereview.chromium.org/1894973009

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#388485}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk