mash: Prerequisites for removing ShelfDelegate.

ash/test/test_shell_delegate.h

Index: ash/test/test_shell_delegate.h
diff --git a/ash/test/test_shell_delegate.h b/ash/test/test_shell_delegate.h
index 296ea3fc2459d687547fa847365457a850274675..ab64ef4e9f62f79b1f2b402918695bb902857d0c 100644
--- a/ash/test/test_shell_delegate.h
+++ b/ash/test/test_shell_delegate.h
@@ -19,6 +19,8 @@ class KeyboardUI;
 namespace ash {
 namespace test {
 
+class ShelfInitializer;
+
 class TestShellDelegate : public ShellDelegate {
  public:
   TestShellDelegate();
@@ -68,6 +70,7 @@ class TestShellDelegate : public ShellDelegate {
   bool multi_profiles_enabled_;
   bool force_maximize_on_first_run_;
   bool touchscreen_enabled_in_local_pref_;
+  std::unique_ptr<ShelfInitializer> shelf_initializer_;
 
   DISALLOW_COPY_AND_ASSIGN(TestShellDelegate);
 };