Use AutoValue from external/auto am: 84052f24c4 am: 0a21d89f37

Original change: https://android-review.googlesource.com/c/platform/tools/apifinder/+/1350863

Change-Id: Iaecb67ed1eeb890b29ac4e6f2808a6f9dff001c8
diff --git a/src/main/com/android/apifinder/JavaApiUsedByMainlineModule.java b/src/main/com/android/apifinder/JavaApiUsedByMainlineModule.java
index 8e04688..8b76e42 100644
--- a/src/main/com/android/apifinder/JavaApiUsedByMainlineModule.java
+++ b/src/main/com/android/apifinder/JavaApiUsedByMainlineModule.java
@@ -16,7 +16,7 @@
 
 package com.android.apifinder;
 
-import static com.google.errorprone.BugPattern.SeverityLevel.WARNING;
+import static com.google.errorprone.BugPattern.SeverityLevel.SUGGESTION;
 
 import com.google.auto.service.AutoService;
 import com.google.errorprone.BugPattern;
@@ -41,7 +41,7 @@
 @BugPattern(
     name = "JavaApiUsedByMainlineModule",
     summary = "Any public method used by a mainline module.",
-    severity = WARNING)
+    severity = SUGGESTION)
 public final class JavaApiUsedByMainlineModule extends BugChecker
     implements MethodInvocationTreeMatcher, NewClassTreeMatcher {