Fix //media:media_unittests for gn

BUILD.gn

 # Copyright (c) 2013 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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 283 matching lines @@
       "//extensions:extensions_browsertests",  # PASSES 2/25/2015
       "//extensions:extensions_unittests",  # PASSES 2/25/2015
       "//extensions/shell:app_shell_unittests",  # PASSES 2/25/2015
       "//google_apis/gcm:gcm_unit_tests",  # PASSES 2/25/2015
       "//google_apis:google_apis_unittests",  # PASSES 2/25/2015
       "//gpu:gpu_unittests",  # PASSES 2/25/2015
       "//ipc:ipc_tests",  # PASSES 2/25/2015
       "//ipc/mojo:ipc_mojo_unittests",  # PASSES 2/25/2015
       "//jingle:jingle_unittests",  # PASSES 2/25/2015
       "//media/cast:cast_unittests",  # PASSES 2/25/2015
-      "//media:media_unittests",  # TODO(GYP) MidiManagerTest fails.
+      "//media:media_unittests",  # PASSES 3/3/2015
       "//mojo/common:mojo_common_unittests",  # PASSES 2/25/2015
       "//net:net_unittests",  # PASSES 2/25/2015
       "//printing:printing_unittests",  # PASSES 2/25/2015
       "//sandbox/linux:sandbox_linux_unittests",  # PASSES 2/25/2015
       "//skia:skia_unittests",  # PASSES 2/25/2015
       "//sql:sql_unittests",  # PASSES 2/25/2015
       "//sync:sync_unit_tests",  # PASSES 2/25/2015
       "//third_party/cacheinvalidation:cacheinvalidation_unittests",  # PASSES 2/25/2015
       "//third_party/mojo/src/mojo/edk/system:mojo_system_unittests",  # PASSES 2/25/2015
       "//third_party/mojo/src/mojo/edk/test:mojo_public_bindings_unittests",  # PASSES 2/25/2015
@@ skipping 10 matching lines @@
       "//ui/touch_selection:ui_touch_selection_unittests",  # PASSES 2/25/2015
       "//ui/views:views_unittests",  # PASSES (*) 2/25/2015
       "//ui/wm:wm_unittests",  # PASSES 2/25/2015
       "//url:url_unittests",  # PASSES 2/25/2015
 
       # Note:
       # (*) Fails but failures match GYP build at time of testing.
     ]
   }
 }