[CQ] Inheritance: remove redundant method declaration (#8000)

This declaration adds nothing. An empty body is inherited from the adapter.

Author: pq

flutter-idea/src/io/flutter/vmService/FlutterFramesMonitor.java

@@ -75,10 +75,6 @@ public FlutterFramesMonitor(@NotNull DisplayRefreshRateManager displayRefreshRat
       public void received(String streamId, Event event) {
         onVmServiceReceived(streamId, event);
       }
-
-      @Override
-      public void connectionClosed() {
-      }
     });
   }