Fix and enable mojo:media_pipeline_integration_apptests.

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 596 matching lines @@
 # This group contains all the targets needed to run mojo's apptest_runner.
 group("mojo_apptests") {
   testonly = true
 
   deps = []
 
   if (is_win || is_linux) {
     deps += [
       "//mandoline:tests",
       "//mash/wm:tests",
+      "//media/mojo/services:tests",
       "//ui/views/mus:tests",
     ]
   }
 }
 
 group("gn_only") {
   testonly = true
 
   deps = []
 
@@ skipping 262 matching lines @@
       ]
 
       if (target_cpu == "x86") {
         deps += [ "//chrome/tools/crash_service:crash_service_win64" ]
       }
     } else {
       deps += [ "//breakpad:minidump_stackwalk($host_toolchain)" ]
     }
   }
 }