Format all tests.

tests/language_strong/method_override_test.dart

Index: tests/language_strong/method_override_test.dart
diff --git a/tests/language_strong/method_override_test.dart b/tests/language_strong/method_override_test.dart
index b1a8b1d5fde371d6f3639108a296724e9093d7e6..c5428d3e73b1161cb245388422fd03cfa07e03f7 100644
--- a/tests/language_strong/method_override_test.dart
+++ b/tests/language_strong/method_override_test.dart
@@ -19,12 +19,11 @@ class MapBase<K, V> implements Map<K, V> {
 
     Expect.isTrue(remove is RemoveFunctionType);
     Expect.isTrue(remove is RemoveFunctionType<int, int>);
-    Expect.isTrue(remove is !RemoveFunctionType<String, int>);
-    Expect.isTrue(remove is !RemoveFunctionType<MapBase<int, int>, int>);
+    Expect.isTrue(remove is! RemoveFunctionType<String, int>);
+    Expect.isTrue(remove is! RemoveFunctionType<MapBase<int, int>, int>);
   }
 }
 
-
 class MethodOverrideTest extends MapBase<String, String> {
   String remove(String key) {
     throw 'Must be implemented';
@@ -36,14 +35,13 @@ class MethodOverrideTest extends MapBase<String, String> {
 
     Expect.isTrue(remove is RemoveFunctionType);
     Expect.isTrue(remove is RemoveFunctionType<String, String>);
-    Expect.isTrue(remove is !RemoveFunctionType<int, int>);
+    Expect.isTrue(remove is! RemoveFunctionType<int, int>);
     Expect.isTrue(super.remove is RemoveFunctionType);
     Expect.isTrue(super.remove is RemoveFunctionType<String, String>);
-    Expect.isTrue(super.remove is !RemoveFunctionType<int, int>);
+    Expect.isTrue(super.remove is! RemoveFunctionType<int, int>);
   }
 }
 
-
 main() {
   // Since method overriding is only checked statically, explicitly check
   // the subtyping relation using a function type alias.