Remove uses of libcore.util.Objects.hashCode / equals.

Use public API in java.util.Objects instead.

Test: make
Change-Id: I413280f254743a2efa2640a2194693aeb5980605
diff --git a/services/core/java/com/android/server/pm/UserManagerService.java b/services/core/java/com/android/server/pm/UserManagerService.java
index 0eeaf66..de7e21a 100644
--- a/services/core/java/com/android/server/pm/UserManagerService.java
+++ b/services/core/java/com/android/server/pm/UserManagerService.java
@@ -101,7 +101,6 @@
 import com.android.server.storage.DeviceStorageMonitorInternal;
 
 import libcore.io.IoUtils;
-import libcore.util.Objects;
 
 import org.xmlpull.v1.XmlPullParser;
 import org.xmlpull.v1.XmlPullParserException;
@@ -122,6 +121,7 @@
 import java.util.Collections;
 import java.util.LinkedList;
 import java.util.List;
+import java.util.Objects;
 
 /**
  * Service for {@link UserManager}.
@@ -604,7 +604,7 @@
                     return;
                 }
                 String currentAccount = userData.account;
-                if (!Objects.equal(currentAccount, accountName)) {
+                if (!Objects.equals(currentAccount, accountName)) {
                     userData.account = accountName;
                     userToUpdate = userData;
                 }