Update to make the code work with strong-mode clean Zone API.

pkgs/pool/CHANGELOG.md

diff --git a/pkgs/pool/CHANGELOG.md b/pkgs/pool/CHANGELOG.md
index 80d54c7..63cf006 100644
--- a/pkgs/pool/CHANGELOG.md
+++ b/pkgs/pool/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.3.2
+
+* Update to make the code work with strong-mode clean Zone API.
+
 ## 1.3.1
 
 * Fix the type annotation of `Pool.withResource()` to indicate that it takes

pkgs/pool/lib/pool.dart

diff --git a/pkgs/pool/lib/pool.dart b/pkgs/pool/lib/pool.dart
index 04aaaea..d81386f 100644
--- a/pkgs/pool/lib/pool.dart
+++ b/pkgs/pool/lib/pool.dart
@@ -183,8 +183,9 @@
       _allocatedResources--;
       if (_allocatedResources == 0) _closeGroup.close();
     } else {
-      _onReleaseCallbacks.add(
-          Zone.current.bindCallback(onRelease, runGuarded: false));
+      var zone = Zone.current;
+      var registered = zone.registerCallback(onRelease);
+      _onReleaseCallbacks.add(() => zone.run(registered));
     }
   }
 

pkgs/pool/pubspec.yaml

diff --git a/pkgs/pool/pubspec.yaml b/pkgs/pool/pubspec.yaml
index 8efc8e5..4a8271b 100644
--- a/pkgs/pool/pubspec.yaml
+++ b/pkgs/pool/pubspec.yaml
@@ -1,5 +1,5 @@
 name: pool
-version: 1.3.1
+version: 1.3.2
 author: Dart Team <misc@dartlang.org>
 description: A class for managing a finite pool of resources.
 homepage: https://github.com/dart-lang/pool