Revert of Letting Flash join MediaSession (stack implementaion)

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("//mojo/public/tools/bindings/mojom.gni")
@@ skipping 1581 matching lines @@
       "../browser/android/java/gin_java_method_invocation_helper_unittest.cc",
       "../browser/android/java/java_type_unittest.cc",
       "../browser/android/java/jni_helper_unittest.cc",
       "../browser/android/scoped_surface_request_manager_unittest.cc",
       "../browser/android/url_request_content_job_unittest.cc",
       "../renderer/java/gin_java_bridge_value_converter_unittest.cc",
       "../renderer/media/android/stream_texture_wrapper_impl_unittest.cc",
       "../renderer/media/android/webmediasession_android_unittest.cc",
     ]
     sources -= [
-      "../browser/media/session/audio_focus_manager_unittest.cc",
       "../browser/power_usage_monitor_impl_unittest.cc",
       "../browser/webui/url_data_manager_backend_unittest.cc",
     ]
     deps -= [ "//device/battery" ]
 
     deps += [
       "//base:base_java_unittest_support",
       "//content/public/android:content_java",
       "//device/geolocation:geolocation_java",
       "//v8:v8_external_startup_data_assets",
@@ skipping 88 matching lines @@
   if (is_android) {
     deps += [ "//testing/android/native_test:native_test_native_code" ]
   }
 }
 
 group("fuzzers") {
   deps = [
     "//content/test/fuzzer",
   ]
 }