Allow local file to run though content handler.

mojo/common/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # GYP version: mojo/mojo_base.gyp:mojo_common_lib
 component("common") {
   output_name = "mojo_common_lib"
 
   sources = [
     "common_type_converters.cc",
@@ skipping 29 matching lines @@
     "//mojo/edk/test:test_support",
     "//mojo/environment:chromium",
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/test_support:test_utils",
     "//testing/gtest",
     "//url",
   ]
 
   sources = [
     "common_type_converters_unittest.cc",
+    "data_pipe_utils_unittest.cc",
     "handle_watcher_unittest.cc",
     "message_pump_mojo_unittest.cc",
   ]
 }