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

pkg/unittest/test/matchers_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('matcherTest');
-#import('../../../pkg/unittest/unittest.dart');
-#source('test_utils.dart');
+library unittestTests;
+import '../../../pkg/unittest/lib/unittest.dart';
+part 'test_utils.dart';
 
 doesNotThrow() {}
 doesThrow() { throw 'X'; }
 
 class PrefixMatcher extends BaseMatcher {
   final String _prefix;
   const PrefixMatcher(this._prefix);
   bool matches(item, MatchState matchState) {
     return item is String &&
         (collapseWhitespace(item)).startsWith(collapseWhitespace(_prefix));
@@ skipping 101 matching lines @@
       shouldPass(() { throw new IllegalJSRegExpException('',''); },
           throwsIllegalJSRegExpException);
       shouldFail(() { throw new Exception(); },
           throwsIllegalJSRegExpException,
         "Expected: throws an exception which matches IllegalJSRegExpException "
         "but:  exception <Exception> does not match "
             "IllegalJSRegExpException.");
     });
 
     test('throwsRangeError', () {
-      shouldPass(() { throw new RangeError.value(0); },
+      shouldPass(() { throw new RangeError(0); },
           throwsRangeError);
       shouldFail(() { throw new Exception(); },
           throwsRangeError,
         "Expected: throws an exception which matches RangeError "
-        "but:  exception <Exception> does not match "
-            "RangeError.");
+        "but:  exception <Exception> does not match RangeError.");
     });
 
     test('throwsNoSuchMethodError', () {
       shouldPass(() { throw new NoSuchMethodError(null, '', null); },
           throwsNoSuchMethodError);
       shouldFail(() { throw new Exception(); },
           throwsNoSuchMethodError,
         "Expected: throws an exception which matches NoSuchMethodError "
         "but:  exception <Exception> does not match "
             "NoSuchMethodError.");
@@ skipping 391 matching lines @@
       var w = new Widget();
       w.price = 10;
       shouldPass(w, new HasPrice(greaterThan(0)));
       shouldFail(w, new HasPrice(greaterThan(10)),
           'Expected: Widget with a price that is a value greater than <10> '
           'but: price was <10>.');
     });
   });
 }