Fix style.

Runtime/animation/listener_helpers.mixin.gen.cs

 
         public override void removeListener(VoidCallback listener) {
             bool removed = this._listeners.Remove(listener);
-            if(removed) {
+            if (removed) {
                 this.didUnregisterListener();
             }
         }
 
         public override void removeListener(VoidCallback listener) {
             bool removed = this._listeners.Remove(listener);
-            if(removed) {
+            if (removed) {
                 this.didUnregisterListener();
             }
         }
 
         public override void removeStatusListener(AnimationStatusListener listener) {
             bool removed = this._statusListeners.Remove(listener);
-            if(removed) {
+            if (removed) {
                 this.didUnregisterListener();
             }
         }
 
         public override void removeStatusListener(AnimationStatusListener listener) {
             bool removed = this._statusListeners.Remove(listener);
-            if(removed) {
+            if (removed) {
                 this.didUnregisterListener();
             }
         }
 
         public override void removeStatusListener(AnimationStatusListener listener) {
             bool removed = this._statusListeners.Remove(listener);
-            if(removed) {
+            if (removed) {
                 this.didUnregisterListener();
             }
         }

Runtime/animation/listener_helpers.mixin.njk

 
         public override void removeListener(VoidCallback listener) {
             bool removed = this._listeners.Remove(listener);
-            if(removed) {
+            if (removed) {
                 this.didUnregisterListener();
             }
         }
 
         public override void removeStatusListener(AnimationStatusListener listener) {
             bool removed = this._statusListeners.Remove(listener);
-            if(removed) {
+            if (removed) {
                 this.didUnregisterListener();
             }
         }