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

utils/tests/pub/version_solver_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_update_test');
 
 #import('dart:io');
 #import('dart:isolate');
 
 #import('../../pub/lock_file.dart');
@@ skipping 451 matching lines @@
     throw 'no';
   }
 
   Package mockPackage(String description, String version,
       Map dependencyStrings) {
     // Build the pubspec dependencies.
     var dependencies = <PackageRef>[];
     dependencyStrings.forEach((name, constraint) {
       var parsed = parseSource(name);
       var description = parsed.first;
-      var packageName = description.replaceFirst(new RegExp(@"-[^-]+$"), "");
+      var packageName = description.replaceFirst(new RegExp(r"-[^-]+$"), "");
       dependencies.add(new PackageRef(packageName, parsed.last,
           new VersionConstraint.parse(constraint), description));
     });
 
     var pubspec = new Pubspec(
         description, new Version.parse(version), dependencies);
     return new Package.inMemory(pubspec);
   }
 
   void addPackage(Package package) {
@@ skipping 31 matching lines @@
 Future fakeAsync(callback()) {
   var completer = new Completer();
   new Timer(0, (_) {
     completer.complete(callback());
   });
 
   return completer.future;
 }
 
 Pair<String, Source> parseSource(String name) {
-  var match = new RegExp(@"(.*) from (.*)").firstMatch(name);
+  var match = new RegExp(r"(.*) from (.*)").firstMatch(name);
   if (match == null) return new Pair<String, Source>(name, source1);
   switch (match[2]) {
   case 'mock1': return new Pair<String, Source>(match[1], source1);
   case 'mock2': return new Pair<String, Source>(match[1], source2);
   case 'root': return new Pair<String, Source>(match[1], rootSource);
   case 'versionless':
     return new Pair<String, Source>(match[1], versionlessSource);
   }
 }