Clean up public API of SubInfoRecord.

bug: 17575308
Change-Id: I5fad0008ef57188d6b13ebbf4b6ce304b0e67fce
diff --git a/src/com/android/phone/PhoneInterfaceManager.java b/src/com/android/phone/PhoneInterfaceManager.java
index b6a4498..f598daf 100644
--- a/src/com/android/phone/PhoneInterfaceManager.java
+++ b/src/com/android/phone/PhoneInterfaceManager.java
@@ -773,7 +773,7 @@
         boolean isValid = false;
         List<SubInfoRecord> slist = SubscriptionManager.getActiveSubInfoList();
         for (SubInfoRecord subInfoRecord : slist) {
-            if (subInfoRecord.subId == subId) {
+            if (subInfoRecord.getSubscriptionId() == subId) {
                 isValid = true;
                 break;
             }