mash: Move ash_switches.* to ash/common; cleanup DEPS.

ash/test/ash_test_helper.cc

 // Copyright 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.
 
 #include "ash/test/ash_test_helper.h"
 
 #include "ash/accelerators/accelerator_controller.h"
-#include "ash/ash_switches.h"
+#include "ash/common/ash_switches.h"
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/display/display_info.h"
 #include "ash/shell.h"
 #include "ash/shell_init_params.h"
 #include "ash/test/ash_test_views_delegate.h"
 #include "ash/test/content/test_shell_content_state.h"
 #include "ash/test/display_manager_test_api.h"
 #include "ash/test/material_design_controller_test_api.h"
 #include "ash/test/shell_test_api.h"
 #include "ash/test/test_screenshot_delegate.h"
@@ skipping 201 matching lines @@
 bool AshTestHelper::SupportsHostWindowResize() {
 #if defined(OS_WIN)
   return false;
 #else
   return true;
 #endif
 }
 
 }  // namespace test
 }  // namespace ash