Make MediaSession a runtime-enabled feature on Desktop.

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/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build_overrides/v8.gni")
@@ skipping 477 matching lines @@
     ]
 
     libs = [ "oleacc.lib" ]
   }
 
   if (is_android) {
     sources += rebase_path(
             content_tests_gypi_values.content_browsertests_android_sources,
             ".",
             "//content")
-    sources -=
-        [ "../browser/battery_status/battery_monitor_impl_browsertest.cc" ]
+    sources -= [
+      "../browser/battery_status/battery_monitor_impl_browsertest.cc",
+      "../browser/media/session/media_session_delegate_default_browsertest.cc",
+    ]
     deps += [
       ":content_browsertests_java",
       ":content_browsertests_manifest",
       "//content/shell:content_shell_lib",
       "//content/shell/android:content_shell_assets",
       "//content/shell/android:content_shell_jni_headers",
       "//testing/android/native_test:native_test_support",
     ]
     deps -= [ "//device/battery" ]
     android_manifest =
@@ skipping 414 matching lines @@
         "//gpu:test_support",
         "//media/base/android",
         "//media/base/android:media_java",
         "//media/capture/video/android:capture_java",
         "//testing/gmock",
         "//ui/android:ui_java",
       ]
     }
   }
 }