Fix a linker error when building content_unittests

content/test/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("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
@@ skipping 1665 matching lines @@
     }
   }
 
   if (enable_webrtc && enable_plugins) {
     sources += [
       "../renderer/media/pepper_to_video_track_adapter_unittest.cc",
       "../renderer/media/video_track_to_pepper_adapter_unittest.cc",
     ]
   }
 
+  if (enable_mojo_media) {
+    deps += [ "//media/mojo/services" ]
+  }
+
   # Screen capture unit tests.
   if (is_linux || is_mac || is_win) {
     deps += [ "//third_party/libyuv" ]
     sources += [ "../browser/media/capture/web_contents_video_capture_device_unittest.cc" ]
     if (use_aura) {
       sources += [ "../browser/media/capture/cursor_renderer_aura_unittest.cc" ]
     }
     if (is_mac) {
       sources += [ "../browser/media/capture/cursor_renderer_mac_unittest.mm" ]
     }
@@ skipping 159 matching lines @@
   if (is_android) {
     deps += [ "//testing/android/native_test:native_test_native_code" ]
   }
 }
 
 group("fuzzers") {
   deps = [
     "//content/test/fuzzer",
   ]
 }