Don't implicitly run "pub get".

test/serve/web_socket/path_to_urls_errors_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS d.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 'package:json_rpc_2/error_code.dart' as rpc_error_code;
 import 'package:path/path.dart' as p;
 
 import '../../descriptor.dart' as d;
@@ skipping 14 matching lines @@
       d.appPubspec({"foo": {"path": "../foo"}}),
       d.file("top-level.txt", "top-level"),
       d.dir("bin", [
         d.file("foo.txt", "foo"),
       ]),
       d.dir("lib", [
         d.file("myapp.dart", "myapp"),
       ])
     ]).create();
 
-    pubServe(shouldGetFirst: true);
+    pubGet();
+    pubServe();
 
     // Bad arguments.
     expectWebSocketError("pathToUrls", {"path": 123},
         rpc_error_code.INVALID_PARAMS,
         'Parameter "path" for method "pathToUrls" must be a string, but was '
             '123.');
 
     expectWebSocketError("pathToUrls", {"path": "main.dart", "line": 12.34},
         rpc_error_code.INVALID_PARAMS,
         'Parameter "line" for method "pathToUrls" must be an integer, but was '
             '12.34.');
 
     // Unserved directories.
     expectNotServed(p.join('bin', 'foo.txt'));
     expectNotServed(p.join('nope', 'foo.txt'));
     expectNotServed(p.join("..", "bar", "lib", "bar.txt"));
     expectNotServed(p.join("..", "foo", "web", "foo.txt"));
 
     endPubServe();
   });
 }
 
 void expectNotServed(String path) {
   expectWebSocketError("pathToUrls", {"path": path}, NOT_SERVED,
       'Asset path "$path" is not currently being served.');
 }