Format all tests.

tests/language_strong/prefix6_negative_test.dart

Index: tests/language_strong/prefix6_negative_test.dart
diff --git a/tests/language_strong/prefix6_negative_test.dart b/tests/language_strong/prefix6_negative_test.dart
index 5ea4a2abe0d2f28c419167182644515aa5d5ffc0..d0ee6403a3f44f7e27230a9ddd57aab618d20421 100644
--- a/tests/language_strong/prefix6_negative_test.dart
+++ b/tests/language_strong/prefix6_negative_test.dart
@@ -4,6 +4,7 @@
 //
 
 library Prefix6NegativeTest.dart;
+
 import "library10.dart" as lib10;
 
 class Prefix6NegativeTest {
@@ -11,7 +12,7 @@ class Prefix6NegativeTest {
     // Variables in the local scope hide the library prefix.
     var lib10 = 0;
     var result = 0;
-    result += lib10.Library10.static_func();  // This should fail.
+    result += lib10.Library10.static_func(); // This should fail.
   }
 }