Replace 3 @CorePlatformApi usages into single API validateTzData() am: dcbbd24626 am: 50a6cc1061

Original change: https://android-review.googlesource.com/c/platform/system/timezone/+/1494437

Change-Id: Idf98a667f60be8d338f3268372094f2af653d42e
diff --git a/apex/manifest.json b/apex/manifest.json
index 98811b1..c1bdf6a 100644
--- a/apex/manifest.json
+++ b/apex/manifest.json
@@ -1,4 +1,4 @@
 {
   "name": "com.android.tzdata",
-  "version": 300900700
+  "version": 300000000
 }