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

tests/html/typed_arrays_2_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('TypedArrays2Test');
-#import('../../pkg/unittest/unittest.dart');
-#import('../../pkg/unittest/html_config.dart');
-#import('dart:html');
+library TypedArrays2Test;
+import '../../pkg/unittest/lib/unittest.dart';
+import '../../pkg/unittest/lib/html_config.dart';
+import 'dart:html';
 
 main() {
   useHtmlConfiguration();
 
   test('fromBufferTest_dynamic', () {
       var a1 = new Uint8Array(1024);
       for (int i = 0; i < a1.length; i++) {
         a1[i] = i; // 0,1,2,...,254,255,0,1,2,...
       }
 
@@ skipping 52 matching lines @@
       expect(a2[14], 0x03020100);
 
       // OPTIONALS a2 = new Uint32Array.fromBuffer(a1.buffer, length: 30, byteOffset: 456);
       a2 = new Uint32Array.fromBuffer(a1.buffer, 456, 30);
       expect(a2.length, 30);
       expect(a2[0], 0xCBCAC9C8);
       expect(a2[1], 0xCFCECDCC);
       expect(a2[14], 0x03020100);
   });
 }