[cleanup] refactor button_flutter to use SDK

Change-Id: I2e18c1e5376bcef04eb1d320fcbef2ea2f5ed0b4
diff --git a/examples/ui/button_flutter/BUILD.gn b/examples/ui/button_flutter/BUILD.gn
index ab05d0c..ada86e3 100644
--- a/examples/ui/button_flutter/BUILD.gn
+++ b/examples/ui/button_flutter/BUILD.gn
@@ -17,6 +17,6 @@
   deps = [
     "//third_party/dart-pkg/git/flutter/packages/flutter",
     "//topaz/public/dart/fuchsia_scenic_flutter",
-    "//topaz/public/lib/app/dart",
+    "//topaz/public/dart/fuchsia_logger",
   ]
 }
diff --git a/examples/ui/button_flutter/lib/main.dart b/examples/ui/button_flutter/lib/main.dart
index 6121d11..9efd4c2 100644
--- a/examples/ui/button_flutter/lib/main.dart
+++ b/examples/ui/button_flutter/lib/main.dart
@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 import 'package:flutter/material.dart';
-import 'package:lib.app.dart/logging.dart';
+import 'package:fuchsia_logger/logger.dart';
 
 void main() {
   setupLogger(name: 'button_flutter');