Bump Permission APEX version code to 309999999.

The version code in the manifest is only used for development
builds, as release builds dynamically replace it.

This allows us to install development builds on any platform.

Bug: 174770904
Test: build
Change-Id: I7a48365589233e1084cdc8d4b98bd591a131fe39
diff --git a/apex_manifest.json b/apex_manifest.json
index 7960598..6350d54 100644
--- a/apex_manifest.json
+++ b/apex_manifest.json
@@ -1,4 +1,4 @@
 {
   "name": "com.android.permission",
-  "version": 300000000
+  "version": 309999999
 }