mash: Move directly linked NewWindowDelegate to mojom::NewWindowClient.

ash/common/wm_shell.cc

Index: ash/common/wm_shell.cc
diff --git a/ash/common/wm_shell.cc b/ash/common/wm_shell.cc
index d5c49e3bfa97db1d102250991fca9123ff40d62f..c2e7cf2f8e848d123d5108191b0b8a0c13b3ad1f 100644
--- a/ash/common/wm_shell.cc
+++ b/ash/common/wm_shell.cc
@@ -11,7 +11,7 @@
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/focus_cycler.h"
 #include "ash/common/keyboard/keyboard_ui.h"
-#include "ash/common/new_window_delegate.h"
+#include "ash/common/new_window_client_proxy.h"
 #include "ash/common/palette_delegate.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/shelf/app_list_shelf_item_delegate.h"
@@ -84,8 +84,6 @@ void WmShell::Initialize(const scoped_refptr<base::SequencedWorkerPool>& pool) {
   // Shelf, and WallPaper could be created by the factory.
   views::FocusManagerFactory::Install(new AshFocusManagerFactory);
 
-  new_window_delegate_.reset(delegate_->CreateNewWindowDelegate());
-
   wallpaper_controller_.reset(new WallpaperController(blocking_pool_));
 }
 
@@ -236,6 +234,8 @@ WmShell::WmShell(std::unique_ptr<ShellDelegate> shell_delegate)
       immersive_context_(base::MakeUnique<ImmersiveContextAsh>()),
       locale_notification_controller_(
           base::MakeUnique<LocaleNotificationController>()),
+      new_window_client_(base::MakeUnique<NewWindowClientProxy>(
+          delegate_->GetShellConnector())),
       shelf_controller_(base::MakeUnique<ShelfController>()),
       system_tray_controller_(base::MakeUnique<SystemTrayController>(
           delegate_->GetShellConnector())),