Flutter doctor error message lookup (#23889)

packages/flutter_tools/lib/src/context_runner.dart

diff --git a/packages/flutter_tools/lib/src/context_runner.dart b/packages/flutter_tools/lib/src/context_runner.dart
index d9dff8a..31a88b4 100644
--- a/packages/flutter_tools/lib/src/context_runner.dart
+++ b/packages/flutter_tools/lib/src/context_runner.dart
@@ -18,6 +18,7 @@
 import 'base/os.dart';
 import 'base/platform.dart';
 import 'base/time.dart';
+import 'base/user_messages.dart';
 import 'base/utils.dart';
 import 'cache.dart';
 import 'compile.dart';
@@ -81,6 +82,7 @@
       SystemClock: () => const SystemClock(),
       Stdio: () => const Stdio(),
       Usage: () => Usage(),
+      UserMessages: () => UserMessages(),
       Xcode: () => Xcode(),
       XcodeProjectInterpreter: () => XcodeProjectInterpreter(),
     },