Format all tests.

tests/corelib_strong/regexp/lookahead_test.dart

Index: tests/corelib_strong/regexp/lookahead_test.dart
diff --git a/tests/corelib_strong/regexp/lookahead_test.dart b/tests/corelib_strong/regexp/lookahead_test.dart
index fce48cd5ed35b958aaae707262f591273f9041b0..2248d85e0cb82d9e73ff1251454f48456b9a542a 100644
--- a/tests/corelib_strong/regexp/lookahead_test.dart
+++ b/tests/corelib_strong/regexp/lookahead_test.dart
@@ -109,8 +109,6 @@ void main() {
   execRE(new RegExp(r"^(?:(?=(b))|a)b"), "ab", ["ab", null]);
   execRE(new RegExp(r"^(?:(?=(b)(?:(?=(c))|d))|)bd"), "bd", ["bd", "b", null]);
 
-
-
   // Test of Negative Look-Ahead.
 
   re = new RegExp(r"(?!x).");
@@ -123,7 +121,6 @@ void main() {
   execRE(re, "4", ["4", null]);
   execRE(re, "x", ["", null]);
 
-
   // Test mixed nested look-ahead with captures.
 
   re = new RegExp(r"^(?=(x)(?=(y)))");