Restructure pkg/unittest and pkg/webdriver to follow the pub conventions.

tests/html/typed_arrays_3_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-#library('TypedArrays3Test');
-#import('../../pkg/unittest/unittest.dart');
-#import('../../pkg/unittest/html_config.dart');
-#import('dart:html');
+library TypedArrays3Test;
+import '../../pkg/unittest/lib/unittest.dart';
+import '../../pkg/unittest/lib/html_config.dart';
+import 'dart:html';
 
 main() {
   useHtmlConfiguration();
 
   test('setElementsTest_dynamic', () {
       var a1 = new Int8Array(1024);
 
       a1.setElements([0x50,0x60,0x70], 4);
 
       var a2 = new Uint32Array.fromBuffer(a1.buffer);
@@ skipping 12 matching lines @@
 
       Uint32Array a2 = new Uint32Array.fromBuffer(a1.buffer);
       expect(a2[0], 0x00000000);
       expect(a2[1], 0x00706050);
 
       a2.setElements([0x01020304], 2);
       expect(a1[8], 0x04);
       expect(a1[11], 0x01);
   });
 }