[XRandRBrightness] Don't call for xrandr if it's not available
Check whether the extension is available before calling into it. REVIEW: 126146 BUG: 352462 FIXED-IN: 5.5.1
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Check whether the extension is available before calling into it. REVIEW: 126146 BUG: 352462 FIXED-IN: 5.5.1