Fix media_mojo builds

media/mojo/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.
 
 import("//testing/test.gni")
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "clients/mojo_audio_decoder_unittest.cc",
     "clients/mojo_cdm_unittest.cc",
     "clients/mojo_renderer_unittest.cc",
     "common/media_type_converters_unittest.cc",
     "common/mojo_decoder_buffer_converter_unittest.cc",
     "common/mojo_shared_buffer_video_frame_unittest.cc",
     "services/mojo_cdm_allocator_unittest.cc",
   ]
 
+  # As long as //media/mojo/services:lib is a source_set, this needs to be
+  # set as the source will be bundled with this test code.
+  # http://crbug.com/670094
+  defines = [ "MEDIA_MOJO_IMPLEMENTATION" ]
+
   deps = [
     "//base",
     "//base/test:test_support",
     "//media",
     "//media:cdm_api",
     "//media/base:test_support",
     "//media/mojo/clients",
     "//media/mojo/common",
     "//media/mojo/interfaces",
     "//media/mojo/services:lib",

[xhwang, 2017/03/08 00:35:18]

Can you depend on //media/mojo/services instead then we don't need the hack?

     "//services/service_manager/tests:interfaces",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/gfx:test_support",
   ]
 }
 
 test("media_mojo_unittests") {
-  # crbug.com/676418: Suppress symbol import warnings.
-  if (is_win && is_component_build) {
-    ldflags = [
-      "/ignore:4217",
-      "/ignore:4049",
-    ]
-  }
-
   deps = [
     ":unit_tests",
     "//mojo/edk/test:run_all_unittests",
   ]
 }