Fixed checked-mode error in security_context_argument_test.

tests/standalone/io/security_context_argument_test.dart

Index: tests/standalone/io/security_context_argument_test.dart
diff --git a/tests/standalone/io/security_context_argument_test.dart b/tests/standalone/io/security_context_argument_test.dart
index 4309fb20974f94586aee688c450ca02efc481f74..4b53ed6d54554d4942a969597c4eb6fb8b53c953 100644
--- a/tests/standalone/io/security_context_argument_test.dart
+++ b/tests/standalone/io/security_context_argument_test.dart
@@ -9,6 +9,7 @@ String localFile(path) => Platform.script.resolve(path).toFilePath();
 
 bool printException(e) { print(e); return true; }
 bool argumentError(e) => e is ArgumentError;
+bool argumentTypeError(e) => e is ArgumentError || e is TypeError;

[Søren Gjesse, 2015/10/05 13:25:36]

Please call it argumentOrTypeError.

 bool tlsException(e) => e is TlsException;
 
 void testUsePrivateKeyArguments() {
@@ -26,11 +27,11 @@ void testUsePrivateKeyArguments() {
     Expect.throws(() => c.usePrivateKey(
           localFile('certificates/server_key_oops.pem'), password: "dartdart"),
         tlsException);
-    Expect.throws(() => c.usePrivateKey(1), argumentError);
+    Expect.throws(() => c.usePrivateKey(1), argumentTypeError);
     Expect.throws(() => c.usePrivateKey(null), argumentError);
     Expect.throws(() => c.usePrivateKey(
           localFile('certificates/server_key_oops.pem'), password: 3),
-        argumentError);
+        argumentTypeError);
     c.usePrivateKey(
         localFile('certificates/server_key.pem'), password: "dartdart");
 }