Fix typo in DEPS

DEPS

 # 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.
 
 # IMPORTANT:
 # Before adding or updating dependencies, please review the documentation here:
 # https://github.com/dart-lang/sdk/wiki/Adding-and-Updating-Dependencies
 
 vars = {
   # The dart_root is the root of our sdk checkout. This is normally
@@ skipping 229 matching lines @@
       Var("github_mirror") + "linter.git" + Var("linter_tag"),
   Var("dart_root") + "/third_party/pkg/logging":
       Var("github_mirror") + "logging.git" + Var("logging_tag"),
   Var("dart_root") + "/third_party/pkg/markdown":
       Var("github_mirror") + "markdown.git" + Var("markdown_tag"),
   Var("dart_root") + "/third_party/pkg/matcher":
       Var("github_mirror") + "matcher.git" + Var("matcher_tag"),
   Var("dart_root") + "/third_party/pkg/mime":
       Var("github_mirror") + "mime.git" + Var("mime_rev"),
   Var("dart_root") + "/third_party/pkg/mockito":
-      Var("github_mirror") + mockito.git" + Var("mockito_tag"),
+      Var("github_mirror") + "mockito.git" + Var("mockito_tag"),
   Var("dart_root") + "/third_party/pkg/mustache4dart":
       Var("chromium_git")
       + "/external/github.com/valotas/mustache4dart.git"
       + Var("mustache4dart_tag"),
   Var("dart_root") + "/third_party/pkg/oauth2":
       Var("github_mirror") + "oauth2.git" + Var("oauth2_tag"),
   Var("dart_root") + "/third_party/observatory_pub_packages":
       Var("github_mirror") + "observatory_pub_packages.git"
       + Var("observatory_pub_packages_rev"),
   Var("dart_root") + "/third_party/pkg_tested/package_config":
@@ skipping 218 matching lines @@
     # Update the Windows toolchain if necessary.
     'name': 'win_toolchain',
     'pattern': '.',
     'action': ['python', 'sdk/build/vs_toolchain.py', 'update'],
   },
   {
     "pattern": ".",
     "action": ["python", Var("dart_root") + "/tools/generate_buildfiles.py"],
   },
 ]