Bug 1365855 - Drop comment about needing to update SMIL animation styles in ServoRestyleManager::UpdateOnlyAnimationStyles; r?hiro; DONTBUILD Unlike GeckoRestyleManager::UpdateOnlyAnimationStyles which is called from *both* GeckoRestyleManager::ProcessPendingRestyles and FlushThrottledStyles, ServoRestyleManager::UpdateOnlyAnimationStyles is only called from FlushThrottledStyles which is what we use to update transform animations before doing hit-testing. In this case, there doesn't appear to be any situation where throttled SMIL animations need to be updated since SMIL animations are only throttled when they apply to display:none content (bug 1209405 and bug 1322970) in which case they should not affect hit testing. MozReview-Commit-ID: 4bt7hCSa7Xr

--- a/layout/base/ServoRestyleManager.cpp
+++ b/layout/base/ServoRestyleManager.cpp
@@ -1200,17 +1200,16 @@ ServoRestyleManager::ProcessAllPendingAt
     Servo_ProcessInvalidations(StyleSet()->RawSet(), iter.Key(), &mSnapshots);
   }
   ClearSnapshots();
 }
 
 void
 ServoRestyleManager::UpdateOnlyAnimationStyles()
 {
-  // Bug 1365855: We also need to implement this for SMIL.
   bool doCSS = PresContext()->EffectCompositor()->HasPendingStyleUpdates();
   if (!doCSS) {
     return;
   }
 
   DoProcessPendingRestyles(ServoTraversalFlags::FlushThrottledAnimations);
 }