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

tests/html/typed_arrays_range_checks_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('TypedArraysRangeCheckTest');
-#import('../../pkg/unittest/unittest.dart');
-#import('../../pkg/unittest/html_config.dart');
-#import('dart:html');
+library TypedArraysRangeCheckTest;
+import '../../pkg/unittest/lib/unittest.dart';
+import '../../pkg/unittest/lib/html_config.dart';
+import 'dart:html';
 
 main() {
   useHtmlConfiguration();
 
   test('outOfRangeAccess_dynamic', () {
       var a = new Uint8Array(1024);
 
       expect(a[a.length], isNull);
       expect(a[a.length + 1], isNull);
       expect(a[a.length + 1024], isNull);
@@ skipping 26 matching lines @@
       // It's harder to test out of range setters, but let's do some minimum.
       a[a.length] = 0xdeadbeaf;
       a[a.length + 1] = 0xdeadbeaf;
       a[a.length + 1024] = 0xdeadbeaf;
 
       // a[-1] = 0xdeadbeaf;
       // a[-2] = 0xdeadbeaf;
       // a[-1024] = 0xdeadbeaf;
   });
 }