Format all tests.

tests/language_strong/prefix10_test.dart

Index: tests/language_strong/prefix10_test.dart
diff --git a/tests/language_strong/prefix10_test.dart b/tests/language_strong/prefix10_test.dart
index d01aeeeb7137cb4fd614c4953789f763ea82599c..4f0f051078cb901806467743e7dbbb5f846dbac8 100644
--- a/tests/language_strong/prefix10_test.dart
+++ b/tests/language_strong/prefix10_test.dart
@@ -3,6 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 library Prefix10Test.dart;
+
 import "package:expect/expect.dart";
 import "library10.dart" as lib10;
 import "library11.dart" as lib11;
@@ -20,6 +21,7 @@ class Prefix10Test {
     result += lib10.Library10.static_fld;
     Expect.equals(10, result);
   }
+
   static Test2() {
     var result = 0;
     var obj = new lib11.Library11(4);
@@ -32,10 +34,12 @@ class Prefix10Test {
     result += lib11.Library11.static_fld;
     Expect.equals(10, result);
   }
+
   static Test3() {
     Expect.equals(10, lib10.top_level10);
     Expect.equals(20, lib10.top_level_func10());
   }
+
   static Test4() {
     Expect.equals(100, lib11.top_level11);
     Expect.equals(200, lib11.top_level_func11());