Update package names to work with the proto3 compiler

Bug: b/28974522
Change-Id: I5f3adf4946ee4ba1e09e4f40afe83c151405972a
diff --git a/services/core/java/com/android/server/am/ActivityMetricsLogger.java b/services/core/java/com/android/server/am/ActivityMetricsLogger.java
index be8f21d..facfeb6 100644
--- a/services/core/java/com/android/server/am/ActivityMetricsLogger.java
+++ b/services/core/java/com/android/server/am/ActivityMetricsLogger.java
@@ -16,7 +16,7 @@
 import android.util.Slog;
 
 import com.android.internal.logging.MetricsLogger;
-import com.android.internal.logging.MetricsProto.MetricsEvent;
+import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
 
 import java.util.ArrayList;