Update the Angular/DI tests to latest from github.

third_party/pkg/di/test/fixed-unittest.dart

Index: third_party/pkg/di/test/fixed-unittest.dart
diff --git a/third_party/pkg/di/test/fixed-unittest.dart b/third_party/pkg/di/test/fixed-unittest.dart
index cfb1e8dbfdf3dd8d85c09629675947c5af722a25..5639d27bbbf66498af721895368c246dccf7cd08 100644
--- a/third_party/pkg/di/test/fixed-unittest.dart
+++ b/third_party/pkg/di/test/fixed-unittest.dart
@@ -19,9 +19,11 @@ Matcher toContain(expected) => contains(expected);
 Matcher toBe(expected) => same(expected);
 Matcher instanceOf(Type t) => new IsInstanceOfTypeMatcher(t);
 
-Matcher toThrow(Type exceptionClass, String message) =>
-  new ThrowsMatcher(new ComplexExceptionMatcher(
-      instanceOf(exceptionClass), toContain(message)));
+Matcher toThrow(Type exceptionClass, [message]) => message == null
+      ? new ThrowsMatcher(instanceOf(exceptionClass))
+      : new ThrowsMatcher(new ComplexExceptionMatcher(
+          instanceOf(exceptionClass),
+          message is Matcher ? message : toContain(message)));
 
 Matcher not(Matcher matcher) => new NegateMatcher(matcher);