Deprecate for removal an empty finalize() methods in java.desktop module

Summary

Deprecate for removal empty finalize() methods in the java.desktop module previously deprecated in JDK 9 under JDK-8165641.

Problem

The java.desktop module has a few implementations of the finalize() method which do nothing. We can mark these methods as "forRemoval = true".

Solution

The solution is to deprecate this API in jdk16 and remove it later.

Specification

src/java.desktop/share/classes/java/awt/color/ICC_Profile.java

@@ -757,11 +757,12 @@
       *         ensure that {@code super.finalize()} is invoked as described in
       *         {@link Object#finalize}. See the specification for {@link
       *         Object#finalize()} for further information about migration
       *         options.
       */
-     @Deprecated(since="9")
+     @Deprecated(since = "9", forRemoval = true)
+     @SuppressWarnings("removal")
      protected void finalize () {
      }

src/java.desktop/share/classes/java/awt/image/ColorModel.java

@@ -1628,11 +1628,12 @@
       *     When overriding the {@code finalize} method, its implementation must explicitly
       *     ensure that {@code super.finalize()} is invoked as described in {@link Object#finalize}.
       *     See the specification for {@link Object#finalize()} for further
       *     information about migration options.
       */
-     @Deprecated(since="9")
+     @Deprecated(since = "9", forRemoval = true)
+     @SuppressWarnings("removal")
      public void finalize() {
      }


src/java.desktop/share/classes/java/awt/image/IndexColorModel.java

@@ -1522,11 +1522,12 @@
       *     When overriding the {@code finalize} method, its implementation must explicitly
       *     ensure that {@code super.finalize()} is invoked as described in {@link Object#finalize}.
       *     See the specification for {@link Object#finalize()} for further
       *     information about migration options.
       */
-     @Deprecated(since="9")
+     @Deprecated(since = "9", forRemoval = true)
+     @SuppressWarnings("removal")
      public void finalize() {
      }