Update Virtualization module to protobuf3.

Test: manual atest
Bug: 286984317
Change-Id: Ie338092ae1196bfd260831352312cbd97f6b28e1
diff --git a/microdroid/payload/metadata/src/lib.rs b/microdroid/payload/metadata/src/lib.rs
index bfbec60..f00391a 100644
--- a/microdroid/payload/metadata/src/lib.rs
+++ b/microdroid/payload/metadata/src/lib.rs
@@ -24,7 +24,7 @@
 use std::io::Write;
 
 pub use microdroid_metadata::metadata::{
-    ApexPayload, ApkPayload, Metadata, Metadata_oneof_payload as PayloadMetadata, PayloadConfig,
+    metadata::Payload as PayloadMetadata, ApexPayload, ApkPayload, Metadata, PayloadConfig,
 };
 
 /// Reads a metadata from a reader