api: destroy() and isDestroyed() methods are now default in Destroyable

Change-Id: Ia5afcec8b627794bba7c69ca6245330b60aef5e9
Test: make droid docs and check-ojluni-files
Bug: 29631070

api/test-current.txt

@@ -55019,9 +55019,7 @@ package java.security {
   public static class KeyStore.PasswordProtection implements javax.security.auth.Destroyable java.security.KeyStore.ProtectionParameter {
     ctor public KeyStore.PasswordProtection(char[]);
-    method public synchronized void destroy() throws javax.security.auth.DestroyFailedException;
     method public synchronized char[] getPassword();
-    method public synchronized boolean isDestroyed();
   }
   public static final class KeyStore.PrivateKeyEntry implements java.security.KeyStore.Entry {
@@ -64765,8 +64763,8 @@ package javax.security.auth {
   }
   public abstract interface Destroyable {
-    method public abstract void destroy() throws javax.security.auth.DestroyFailedException;
-    method public abstract boolean isDestroyed();
+    method public default void destroy() throws javax.security.auth.DestroyFailedException;
+    method public default boolean isDestroyed();
   }
   public final class PrivateCredentialPermission extends java.security.Permission {