Bug 1777368 [Linux] Don't init VP8_HW_DECODE/VP9_HW_DECODE features on Linux as they're not used r=alwu

Differential Revision: https://phabricator.services.mozilla.com/D150739

gfx/thebes/gfxPlatform.cpp

@@ -2783,13 +2783,16 @@ void gfxPlatform::InitHardwareVideoConfig() {
     return;
   }
 
+  // We don't use selective VP8/9 decode control on Linux.
+  if (kIsWayland || kIsX11) {
+    return;
+  }
+
   nsCString message;
   nsCString failureId;
 
   FeatureState& featureVP8 = gfxConfig::GetFeature(Feature::VP8_HW_DECODE);
-#ifndef MOZ_WIDGET_GTK
   featureVP8.EnableByDefault();
-#endif
 
   if (!IsGfxInfoStatusOkay(nsIGfxInfo::FEATURE_VP8_HW_DECODE, &message,
                            failureId)) {
@@ -2799,9 +2802,8 @@ void gfxPlatform::InitHardwareVideoConfig() {
   gfxVars::SetUseVP8HwDecode(featureVP8.IsEnabled());
 
   FeatureState& featureVP9 = gfxConfig::GetFeature(Feature::VP9_HW_DECODE);
-#ifndef MOZ_WIDGET_GTK
   featureVP9.EnableByDefault();
-#endif
+
   if (!IsGfxInfoStatusOkay(nsIGfxInfo::FEATURE_VP9_HW_DECODE, &message,
                            failureId)) {
     featureVP9.Disable(FeatureStatus::Blocklisted, message.get(), failureId);