stop using pattern matching

Author: ran-su

xds/src/main/java/io/grpc/xds/XdsServerBuilder.java

@@ -150,7 +150,8 @@ public static XdsServerBuilder forAddress(
             new FilterChainMatchingNegotiatorServerFactory(originalNegotiatorFactory));
     NettyServerBuilder nettyDelegate = NettyServerBuilder.forAddress(address, wrappedCredentials);
     int port = 0;
-    if (address instanceof InetSocketAddress inetSocketAddress) {
+    if (address instanceof InetSocketAddress) {
+      InetSocketAddress inetSocketAddress = (InetSocketAddress) address;
       port = inetSocketAddress.getPort();
     }
     return new XdsServerBuilder(nettyDelegate, port);

xds/src/main/java/io/grpc/xds/XdsServerWrapper.java

@@ -199,7 +199,7 @@ public void uncaughtException(Thread t, Throwable e) {
         null,
         filterRegistry,
         SharedResourceHolder.get(GrpcUtil.TIMER_SERVICE),
-        builder -> {});
+        builder -> { });
     sharedTimeService = true;
   }
 
@@ -222,7 +222,7 @@ public void uncaughtException(Thread t, Throwable e) {
         ldsResourceNameResolver,
         filterRegistry,
         SharedResourceHolder.get(GrpcUtil.TIMER_SERVICE),
-        builder -> {});
+        builder -> { });
     sharedTimeService = true;
   }
 
@@ -246,7 +246,7 @@ public void uncaughtException(Thread t, Throwable e) {
         null,
         filterRegistry,
         timeService,
-        builder -> {});
+        builder -> { });
   }
 
   @VisibleForTesting
@@ -270,7 +270,7 @@ public void uncaughtException(Thread t, Throwable e) {
         ldsResourceNameResolver,
         filterRegistry,
         timeService,
-        builder -> {});
+        builder -> { });
   }
 
   @VisibleForTesting