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

ash/test/test_shell_delegate.cc

Index: ash/test/test_shell_delegate.cc
diff --git a/ash/test/test_shell_delegate.cc b/ash/test/test_shell_delegate.cc
index 42b6952bf9398de90c1dfc13eb86093b54827fa7..8e2fceacf5eac1fa20f0ab562ae3e160f06ff650 100644
--- a/ash/test/test_shell_delegate.cc
+++ b/ash/test/test_shell_delegate.cc
@@ -11,7 +11,6 @@
 #include "ash/common/default_accessibility_delegate.h"
 #include "ash/common/gpu_support_stub.h"
 #include "ash/common/media_delegate.h"
-#include "ash/common/new_window_delegate.h"
 #include "ash/common/palette_delegate.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/test/test_session_state_delegate.h"
@@ -39,26 +38,6 @@ namespace ash {
 namespace test {
 namespace {
 
-class NewWindowDelegateImpl : public NewWindowDelegate {
- public:
-  NewWindowDelegateImpl() {}
-  ~NewWindowDelegateImpl() override {}
-
- private:
-  // NewWindowDelegate:
-  void NewTab() override {}
-  void NewWindow(bool incognito) override {}
-  void OpenFileManager() override {}
-  void OpenCrosh() override {}
-  void OpenGetHelp() override {}
-  void RestoreTab() override {}
-  void ShowKeyboardOverlay() override {}
-  void ShowTaskManager() override {}
-  void OpenFeedbackPage() override {}
-
-  DISALLOW_COPY_AND_ASSIGN(NewWindowDelegateImpl);
-};
-
 class MediaDelegateImpl : public MediaDelegate {
  public:
   MediaDelegateImpl() : state_(MEDIA_CAPTURE_NONE) {}
@@ -179,10 +158,6 @@ AccessibilityDelegate* TestShellDelegate::CreateAccessibilityDelegate() {
   return new DefaultAccessibilityDelegate();
 }
 
-NewWindowDelegate* TestShellDelegate::CreateNewWindowDelegate() {
-  return new NewWindowDelegateImpl;
-}
-
 MediaDelegate* TestShellDelegate::CreateMediaDelegate() {
   return new MediaDelegateImpl;
 }