Use mojo SystemTray interfaces for both mash and classic ash

chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc

 // Copyright (c) 2012 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 "chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.h"
 
 #include "ash/root_window_controller.h"
 #include "ash/shell.h"
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
@@ skipping 21 matching lines @@
 
 ChromeBrowserMainExtraPartsAsh::~ChromeBrowserMainExtraPartsAsh() {}
 
 void ChromeBrowserMainExtraPartsAsh::PreProfileInit() {
   if (chrome::ShouldOpenAshOnStartup())
     chrome::OpenAsh(gfx::kNullAcceleratedWidget);
 
   if (chrome::IsRunningInMash()) {
     immersive_context_ = base::MakeUnique<ImmersiveContextMus>();
     immersive_handler_factory_ = base::MakeUnique<ImmersiveHandlerFactoryMus>();
-#if defined(OS_CHROMEOS)
-    // Must be available at login screen, so initialize before profile.
-    system_tray_client_ = base::MakeUnique<SystemTrayClient>();
-#endif
   }
 
 #if defined(OS_CHROMEOS)
+  // Must be available at login screen, so initialize before profile.
+  system_tray_client_ = base::MakeUnique<SystemTrayClient>();
+
   // For OS_CHROMEOS, virtual keyboard needs to be initialized before profile
   // initialized. Otherwise, virtual keyboard extension will not load at login
   // screen.
   keyboard::InitializeKeyboard();
-#endif
 
-#if defined(OS_CHROMEOS)

[msw, 2016/09/30 23:26:49]

nice :)

   ui::SelectFileDialog::SetFactory(new SelectFileDialogExtensionFactory);
-#endif
+#endif  // defined(OS_CHROMEOS)
 }
 
 void ChromeBrowserMainExtraPartsAsh::PostProfileInit() {
   if (chrome::IsRunningInMash())
     chrome::InitializeMash();
 
   if (!ash::Shell::HasInstance())
     return;
 
   // Initialize TabScrubber after the Ash Shell has been initialized.
   TabScrubber::GetInstance();
   // Activate virtual keyboard after profile is initialized. It depends on the
   // default profile.
   ash::Shell::GetPrimaryRootWindowController()->ActivateKeyboard(
       keyboard::KeyboardController::GetInstance());
 }
 
 void ChromeBrowserMainExtraPartsAsh::PostMainMessageLoopRun() {
 #if defined(OS_CHROMEOS)
   system_tray_client_.reset();
 #endif
   chrome::CloseAsh();
 }