Switch pkg packages, pub, and dartdoc to use package: imports.

pkg/oauth2/test/handle_access_token_response_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 handle_access_token_response_test;
 
 import 'dart:io';
 import 'dart:json' as JSON;
 import 'dart:uri';
 
-import '../../../pkg/unittest/lib/unittest.dart';
-import '../../../pkg/http/lib/http.dart' as http;
-import '../lib/oauth2.dart' as oauth2;
-import '../lib/src/handle_access_token_response.dart';
+import 'package:http/http.dart' as http;
+import 'package:oauth2/oauth2.dart' as oauth2;
+import 'package:oauth2/src/handle_access_token_response.dart';
+import 'package:unittest/unittest.dart';
+
 import 'utils.dart';
 
 final Uri tokenEndpoint = Uri.parse("https://example.com/token");
 
 final DateTime startTime = new DateTime.now();
 
 oauth2.Credentials handle(http.Response response) =>
   handleAccessTokenResponse(response, tokenEndpoint, startTime, ["scope"]);
 
 void main() {
@@ skipping 157 matching lines @@
     test('with a non-string scope throws a FormatException', () {
       expect(() => handleSuccess(scope: 12), throwsFormatException);
     });
 
     test('with a scope sets the scopes', () {
       var credentials = handleSuccess(scope: "scope1 scope2");
       expect(credentials.scopes, equals(["scope1", "scope2"]));
     });
   });
 }