Convert raw strings in pub (and apidoc) to new syntax.

utils/tests/pub/pub_install_sdk_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('pub_tests');
 
 #import('dart:io');
 
 #import('test_pub.dart');
 #import('../../../pkg/unittest/unittest.dart');
 
 main() {
   test('checks out a package from the SDK', () {
     dir(sdkPath, [
       file('revision', '1234'),
       dir('pkg', [
         dir('foo', [
           libDir('foo', 'foo 0.0.1234'),
           libPubspec('foo', '0.0.0-not.used')
         ])
       ])
     ]).scheduleCreate();
 
     dir(appPath, [
       pubspec({"name": "myapp", "dependencies": {"foo": {"sdk": "foo"}}})
     ]).scheduleCreate();
 
     schedulePub(args: ['install'],
-        output: const RegExp(@"Dependencies installed!$"));
+        output: const RegExp(r"Dependencies installed!$"));
 
     packagesDir({"foo": "0.0.1234"}).scheduleValidate();
 
     run();
   });
 
   test('includes transitive dependencies', () {
     dir(sdkPath, [
       file('revision', '1234'),
       dir('pkg', [
         dir('foo', [
           libDir('foo', 'foo 0.0.1234'),
           libPubspec('foo', '0.0.0-not.used', [{'sdk': 'bar'}])
         ]),
         dir('bar', [
           libDir('bar', 'bar 0.0.1234'),
           libPubspec('bar', '0.0.0-not.used')
         ])
       ])
     ]).scheduleCreate();
 
     dir(appPath, [
       appPubspec([{'sdk': 'foo'}])
     ]).scheduleCreate();
 
     schedulePub(args: ['install'],
-        output: const RegExp(@"Dependencies installed!$"));
+        output: const RegExp(r"Dependencies installed!$"));
 
     packagesDir({
       'foo': '0.0.1234',
       'bar': '0.0.1234'
     }).scheduleValidate();
 
     run();
   });
 }