ash: Use SessionController instead of SessionStateDelegate

ash/test/BUILD.gn

 # Copyright 2016 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/ui.gni")
 
 # Used to test ash with an aura backend.
 source_set("ash_with_aura_test_support") {
   testonly = true
   sources = [
@@ skipping 54 matching lines @@
 # |test_support_without_content|.
 static_library("test_support_common") {
   testonly = true
   visibility = [ ":*" ]
   sources = [
     "../common/test/ash_test.cc",
     "../common/test/ash_test.h",
     "../common/test/ash_test_impl.h",
     "../common/test/test_palette_delegate.cc",
     "../common/test/test_palette_delegate.h",
+    "../common/test/test_session_controller_client.cc",
+    "../common/test/test_session_controller_client.h",
     "../common/test/test_session_state_delegate.cc",
     "../common/test/test_session_state_delegate.h",
     "../common/test/test_shelf_delegate.cc",
     "../common/test/test_shelf_delegate.h",
     "../common/test/test_shelf_item_delegate.cc",
     "../common/test/test_shelf_item_delegate.h",
     "../common/test/test_system_tray_delegate.cc",
     "../common/test/test_system_tray_delegate.h",
     "../common/test/wm_shell_test_api.cc",
     "../common/test/wm_shell_test_api.h",
@@ skipping 129 matching lines @@
   deps = [
     ":test_support_with_content",
     "//base",
     "//skia",
     "//testing/gtest",
     "//ui/aura",
     "//ui/base",
     "//ui/gl:test_support",
   ]
 }