Remove overloaded newRealm method with 2 arguments for filtered realms

This removes ambiguity with the existing method when null is passed as
2nd argument

src/main/java/org/codehaus/plexus/classworlds/ClassWorld.java

@@ -73,21 +73,6 @@ public ClassRealm newRealm( String id, ClassLoader classLoader )
         return newRealm( id, classLoader, null );
     }
 
-    /**
-     * Shortcut for {@link #newRealm(String, ClassLoader, Predicate)} with the class loader of the current class.
-     * @param id The identifier for this realm, must not be <code>null</code>.
-     * @param filter a predicate to apply to each resource name to determine if it should be loaded through this class loader
-     * @return the created class realm
-     * @throws DuplicateRealmException in case a realm with the given id does already exist
-     * @since 2.7.0
-     * @see FilteredClassRealm
-     */
-    public synchronized ClassRealm newRealm( String id, Predicate<String> filter )
-         throws DuplicateRealmException
-    {
-        return newRealm( id, getClass().getClassLoader(), filter );
-    }
-
     /**
      * Adds a class realm with filtering.
      * Only resources/classes whose name matches a given predicate are exposed.

src/test/java/org/codehaus/plexus/classworlds/realm/FilteredClassRealmTest.java

@@ -47,7 +47,7 @@ public void setUp() throws DuplicateRealmException
         Set<String> allowedResourcePrefixes = new HashSet<>();
         allowedResourcePrefixes.add( "a." );
         allowedResourcePrefixes.add( "a/Aa" );
-        realmA = this.world.newRealm( "realmA", s -> allowedResourcePrefixes.stream().anyMatch( s::startsWith ) );
+        realmA = this.world.newRealm( "realmA", getClass().getClassLoader(), s -> allowedResourcePrefixes.stream().anyMatch( s::startsWith ) );
     }
 
     @Test