Make StatsEvent.newBuilder() static

Bug: 141696033
Test: m -j
Change-Id: I660a4384f037327ba475e3badd7cba7fea7f77a5
diff --git a/core/java/android/util/StatsEvent.java b/core/java/android/util/StatsEvent.java
index a21f9e0..d6ffd38 100644
--- a/core/java/android/util/StatsEvent.java
+++ b/core/java/android/util/StatsEvent.java
@@ -63,7 +63,7 @@
      * Returns a new StatsEvent.Builder for building StatsEvent object.
      **/
     @NonNull
-    public StatsEvent.Builder newBuilder() {
+    public static StatsEvent.Builder newBuilder() {
         return new StatsEvent.Builder(Buffer.obtain());
     }