Update unittest to new package layout.

pkg/unittest/test/mock_regexp_negative_test.dart

Index: pkg/unittest/test/mock_regexp_negative_test.dart
diff --git a/pkg/unittest/test/mock_regexp_negative_test.dart b/pkg/unittest/test/mock_regexp_negative_test.dart
index 5f5267d84db2147221bc9cb65699aa1f2d0a7bac..e08383b6f35a9b22cf568b2fa0b3b415e1c15bd4 100644
--- a/pkg/unittest/test/mock_regexp_negative_test.dart
+++ b/pkg/unittest/test/mock_regexp_negative_test.dart
@@ -3,13 +3,13 @@
 // BSD-style license that can be found in the LICENSE file.
 
 #library('unittestTest');
-#import('../../../pkg/unittest/unittest.dart');
+#import('../../../pkg/unittest/lib/unittest.dart');
 
 main() {
   test('Mocking: RegExp CallMatcher bad', () {
-    var m = new Mock();           
-    m.when(callsTo(matches('^[A-Z]'))).          
-           alwaysThrow('Method names must start with lower case.');      
-    m.Test();         
+    var m = new Mock();
+    m.when(callsTo(matches('^[A-Z]'))).
+           alwaysThrow('Method names must start with lower case.');
+    m.Test();
   });
 }