Convert //ash from scoped_ptr to std::unique_ptr

ash/shell/shell_delegate_impl.h

Index: ash/shell/shell_delegate_impl.h
diff --git a/ash/shell/shell_delegate_impl.h b/ash/shell/shell_delegate_impl.h
index 5e511e0cfa4c9235e14a864c0413f05423d99838..c971d80b2b57f8cf841d9d36065576d1f865aaaa 100644
--- a/ash/shell/shell_delegate_impl.h
+++ b/ash/shell/shell_delegate_impl.h
@@ -5,6 +5,7 @@
 #ifndef ASH_SHELL_SHELL_DELEGATE_IMPL_H_
 #define ASH_SHELL_SHELL_DELEGATE_IMPL_H_
 
+#include <memory>
 #include <string>
 
 #include "ash/shell_delegate.h"
@@ -57,7 +58,7 @@ class ShellDelegateImpl : public ash::ShellDelegate {
 
  private:
   ShelfDelegateImpl* shelf_delegate_;
-  scoped_ptr<app_list::AppListViewDelegate> app_list_view_delegate_;
+  std::unique_ptr<app_list::AppListViewDelegate> app_list_view_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellDelegateImpl);
 };