[mondrian] Use Dart SDK fuchsia_logger

Change-Id: I4be7127e96f0fa6a80db40b910b76c747c68fae8
diff --git a/public/lib/mondrian/dart/BUILD.gn b/public/lib/mondrian/dart/BUILD.gn
index 9f31c78..0391bd3 100644
--- a/public/lib/mondrian/dart/BUILD.gn
+++ b/public/lib/mondrian/dart/BUILD.gn
@@ -22,7 +22,7 @@
 
   deps = [
     "//third_party/dart-pkg/pub/meta",
-    "//topaz/public/lib/app/dart",
+    "//topaz/public/dart/fuchsia_logger"
   ]
 }
 
diff --git a/public/lib/mondrian/dart/lib/src/tree/surface_tree.dart b/public/lib/mondrian/dart/lib/src/tree/surface_tree.dart
index 4d2b042..c90eb83 100644
--- a/public/lib/mondrian/dart/lib/src/tree/surface_tree.dart
+++ b/public/lib/mondrian/dart/lib/src/tree/surface_tree.dart
@@ -1,7 +1,7 @@
 // Copyright 2019 The Fuchsia Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-import 'package:lib.app.dart/logging.dart';
+import 'package:fuchsia_logger/logger.dart';
 import 'package:meta/meta.dart';
 import '../surface/surface.dart';
 import '../surface/surface_relation.dart';