Make change and version bump to r_aml_300800400 for mainline module file: manifest.json

Change-Id: I94cbbe5aec21f9cd9b3fca434d7b15b315ab3cfe
diff --git a/manifest.json b/manifest.json
index d09b75b..9be9533 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,4 +1,4 @@
 {
   "name": "com.android.sdkext",
-  "version": 300800200
+  "version": 300800400
 }