Update unittest to new package layout.

tests/html/key_name_location_test.dart

 #library('KeyNameLocationTest');
-#import('../../pkg/unittest/unittest.dart');
-#import('../../pkg/unittest/html_config.dart');
+#import('../../pkg/unittest/lib/unittest.dart');
+#import('../../pkg/unittest/lib/html_config.dart');
 #import('dart:html');
 
 // Test for existence of some KeyName and KeyLocation constants.
 
 main() {
 
   useHtmlConfiguration();
 
   test('keyNames', () {
       Expect.equals("DownLeft", KeyName.DOWN_LEFT);
       Expect.equals("Fn", KeyName.FN);
       Expect.equals("F1", KeyName.F1);
       Expect.equals("Meta", KeyName.META);
       Expect.equals("MediaNextTrack", KeyName.MEDIA_NEXT_TRACK);
       Expect.equals("NumLock", KeyName.NUM_LOCK);
       Expect.equals("PageDown", KeyName.PAGE_DOWN);
       Expect.equals("DeadIota", KeyName.DEAD_IOTA);
   });
 
   test('keyLocations', () {
       Expect.equals(0, KeyLocation.STANDARD);
       Expect.equals(1, KeyLocation.LEFT);
       Expect.equals(2, KeyLocation.RIGHT);
       Expect.equals(3, KeyLocation.NUMPAD);
       Expect.equals(4, KeyLocation.MOBILE);
       Expect.equals(5, KeyLocation.JOYSTICK);
   });
 }