ash: Use SessionController instead of SessionStateDelegate

ash/system/overview/overview_button_tray_unittest.cc

 // 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.
 
 #include "ash/common/system/overview/overview_button_tray.h"
 
 #include "ash/common/login_status.h"
+#include "ash/common/session/session_controller.h"
 #include "ash/common/system/status_area_widget.h"
-#include "ash/common/test/test_session_state_delegate.h"
 #include "ash/common/wm/maximize_mode/maximize_mode_controller.h"
 #include "ash/common/wm/overview/window_selector_controller.h"
 #include "ash/common/wm_shell.h"
 #include "ash/public/cpp/shelf_types.h"
 #include "ash/root_window_controller.h"
 #include "ash/rotator/screen_rotation_animator.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/test/ash_test_helper.h"
 #include "ash/test/status_area_widget_test_helper.h"
 #include "base/command_line.h"
@@ skipping 46 matching lines @@
 };
 
 void OverviewButtonTrayTest::SetUp() {
   base::CommandLine::ForCurrentProcess()->AppendSwitch(
       ::switches::kUseFirstDisplayAsInternal);
   AshTestBase::SetUp();
 }
 
 void OverviewButtonTrayTest::NotifySessionStateChanged() {
   GetTray()->SessionStateChanged(
-      test::AshTestHelper::GetTestSessionStateDelegate()->GetSessionState());
+      WmShell::Get()->session_controller()->GetSessionState());
 }
 
 // Ensures that creation doesn't cause any crashes and adds the image icon.
 TEST_F(OverviewButtonTrayTest, BasicConstruction) {
   EXPECT_TRUE(GetImageView(GetTray()) != NULL);
 }
 
 // Test that maximize mode toggle changes visibility.
 // OverviewButtonTray should only be visible when MaximizeMode is enabled.
 // By default the system should not have MaximizeMode enabled.
@@ skipping 166 matching lines @@
   ASSERT_TRUE(WmShell::Get()->IsSystemModalWindowOpen());
   WmShell::Get()->maximize_mode_controller()->EnableMaximizeModeWindowManager(
       true);
   EXPECT_TRUE(GetTray()->visible());
   WmShell::Get()->maximize_mode_controller()->EnableMaximizeModeWindowManager(
       false);
   EXPECT_FALSE(GetTray()->visible());
 }
 
 }  // namespace ash