Allow for invalid signatures in Youtube 16.12

Bug: 189176285
Change-Id: I54bfbd975b8e5ef2a2b819e4a5c83ff94a85c56c

src/test/java/com/android/tools/r8/internal/YouTubeV1612Test.java

diff --git a/src/test/java/com/android/tools/r8/internal/YouTubeV1612Test.java b/src/test/java/com/android/tools/r8/internal/YouTubeV1612Test.java
index 611cc70..f2fe2b8 100644
--- a/src/test/java/com/android/tools/r8/internal/YouTubeV1612Test.java
+++ b/src/test/java/com/android/tools/r8/internal/YouTubeV1612Test.java
@@ -130,7 +130,8 @@
         .assertAllInfoMessagesMatch(
             anyOf(
                 containsString("Ignoring option: -optimizations"),
-                containsString("Proguard configuration rule does not match anything")))
+                containsString("Proguard configuration rule does not match anything"),
+                containsString("Invalid signature")))
         .apply(this::printProtoStats);
   }