commit 8d11f5c763808fe440ac13610f16be3e357661af
author Todd Volkert <tvolkert@users.noreply.github.com> Wed Mar 28 10:58:28 2018 -0700
committer GitHub <noreply@github.com> Wed Mar 28 10:58:28 2018 -0700
tree ba11f452e030554f3b388ba48fae964c5cb25149
parent 4226bff789fccd1e5998a7063ff2a4a427aa5585

Make AppContext immutable and race-free (#15984)

This updates AppContext per the recommendations in #15352

Fixes #15352

packages/flutter_tools/lib/src/ios/mac.dart

diff --git a/packages/flutter_tools/lib/src/ios/mac.dart b/packages/flutter_tools/lib/src/ios/mac.dart
index 89497eb..7356716 100644
--- a/packages/flutter_tools/lib/src/ios/mac.dart
+++ b/packages/flutter_tools/lib/src/ios/mac.dart
@@ -35,9 +35,9 @@
 // Homebrew.
 const PythonModule kPythonSix = const PythonModule('six');
 
-IMobileDevice get iMobileDevice => context.putIfAbsent(IMobileDevice, () => const IMobileDevice());
+IMobileDevice get iMobileDevice => context[IMobileDevice];
 
-Xcode get xcode => context.putIfAbsent(Xcode, () => new Xcode());
+Xcode get xcode => context[Xcode];
 
 class PythonModule {
   const PythonModule(this.name);