Format all tests.

tests/language/inheritance_chain_test.dart

Index: tests/language/inheritance_chain_test.dart
diff --git a/tests/language/inheritance_chain_test.dart b/tests/language/inheritance_chain_test.dart
index ef601523bfc644a2c6701650a7a868dc12766ff0..1f20f0ac9f7c3adb2ec8a6c026798769e410fc4c 100644
--- a/tests/language/inheritance_chain_test.dart
+++ b/tests/language/inheritance_chain_test.dart
@@ -10,7 +10,7 @@ class A extends B {
   get length => 1;
 }
 
-class C extends  D {
+class C extends D {
   get id => "C";
   get length => 3;
 }
@@ -100,4 +100,4 @@ main() {
   Expect.isTrue(o is W);
   o = instances[8];
   Expect.equals(0, o.length);
-}
+}