8371748: Remove the (empty) ThreadPoolExecutor.finalize() method

Reviewed-by: vklang, jpai, alanb

Author: Brent Christian

src/java.base/share/classes/java/util/concurrent/ThreadPoolExecutor.java

@@ -1426,23 +1426,6 @@ public boolean awaitTermination(long timeout, TimeUnit unit)
         }
     }
 
-    // Override without "throws Throwable" for compatibility with subclasses
-    // whose finalize method invokes super.finalize() (as is recommended).
-    // Before JDK 11, finalize() had a non-empty method body.
-
-    /**
-     * @implNote Previous versions of this class had a finalize method
-     * that shut down this executor, but in this version, finalize
-     * does nothing.
-     *
-     * @deprecated Finalization has been deprecated for removal.  See
-     * {@link java.lang.Object#finalize} for background information and details
-     * about migration options.
-     */
-    @Deprecated(since="9", forRemoval=true)
-    @SuppressWarnings("removal")
-    protected void finalize() {}
-
     /**
      * Sets the thread factory used to create new threads.
      *