Correctly implement SelectedSelectionKeySet.remove(...) / contains(...) again so it works with the NIO Selector.

Motivation:

c1a335446d reimplemented remove(...) and contains(...) in a way which made it not work anymore when used by the Selector.

Modifications:

Partly revert changes in c1a335446d.

Result:

Works again as expected

transport/src/main/java/io/netty/channel/nio/SelectedSelectionKeySet.java

@@ -44,6 +44,16 @@ final class SelectedSelectionKeySet extends AbstractSet<SelectionKey> {
         return true;
     }
 
+    @Override
+    public boolean remove(Object o) {
+        return false;
+    }
+
+    @Override
+    public boolean contains(Object o) {
+        return false;
+    }
+
     @Override
     public int size() {
         return size;

transport/src/test/java/io/netty/channel/nio/SelectedSelectionKeySetTest.java

@@ -97,8 +97,8 @@ public class SelectedSelectionKeySetTest {
         SelectedSelectionKeySet set = new SelectedSelectionKeySet();
         assertTrue(set.add(mockKey));
         assertTrue(set.add(mockKey2));
-        assertTrue(set.contains(mockKey));
-        assertTrue(set.contains(mockKey2));
+        assertFalse(set.contains(mockKey));
+        assertFalse(set.contains(mockKey2));
         assertFalse(set.contains(mockKey3));
     }
 
@@ -106,12 +106,7 @@ public class SelectedSelectionKeySetTest {
     public void remove() {
         SelectedSelectionKeySet set = new SelectedSelectionKeySet();
         assertTrue(set.add(mockKey));
+        assertFalse(set.remove(mockKey));
         assertFalse(set.remove(mockKey2));
-        try {
-            set.remove(mockKey);
-            fail();
-        } catch (UnsupportedOperationException expected) {
-            // expected
-        }
     }
 }