Simplify UserHandle.equals

The resulting implementation is computationally cheaper
by saving the exception handling.

Bug: 286548714
Bug: 205124386
Change-Id: Icdf4d42155bad9c9277650ce0344215438c07a99
Test: m
Test: mp droid

core/java/android/os/UserHandle.java

@@ -597,12 +597,9 @@ public final class UserHandle implements Parcelable {
 
     @Override
     public boolean equals(@Nullable Object obj) {
-        try {
-            if (obj != null) {
-                UserHandle other = (UserHandle)obj;
-                return mHandle == other.mHandle;
-            }
-        } catch (ClassCastException ignore) {
+        if (obj instanceof UserHandle) {
+            UserHandle other = (UserHandle) obj;
+            return mHandle == other.mHandle;
         }
         return false;
     }