Update all Angular libs (run update_all.sh).

third_party/pkg/di/lib/src/key.dart

+part of di;
+
+int _lastKeyId = 0;
+int get lastKeyId => _lastKeyId;
+
+Map<int, int> _hashToKey = {};
+
+class Key {
+  final Type type;
+  final Type annotation;
+  final int hashCode;
+  final int id;
+
+  factory Key(Type type, [Type annotation]) {
+    var _hashCode = type.hashCode + annotation.hashCode;
+    var _id = _hashToKey.putIfAbsent(_hashCode, () => _lastKeyId++);
+    return new Key._newKey(type, annotation, _hashCode, _id);
+  }
+
+  Key._newKey(this.type, this.annotation, this.hashCode, this.id);
+
+  bool operator ==(other) =>
+      other is Key && other.hashCode == hashCode;
+
+  String toString() {
+    String asString = type.toString();
+    if (annotation != null) {
+      asString += ' annotated with: ${annotation.toString()}';
+    }
+    return asString;
+  }
+}