Convert //ash from scoped_ptr to std::unique_ptr

ash/shell_init_params.h

Index: ash/shell_init_params.h
diff --git a/ash/shell_init_params.h b/ash/shell_init_params.h
index 68999e4d1f25b62cbfdd8dd91b634557eb0ca1d2..edca1f4d96e2e4756047c4b1720ce1bb7377194f 100644
--- a/ash/shell_init_params.h
+++ b/ash/shell_init_params.h
@@ -5,6 +5,8 @@
 #ifndef ASH_SHELL_INIT_PARAMS_H_
 #define ASH_SHELL_INIT_PARAMS_H_
 
+#include <memory>
+
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
@@ -13,7 +15,6 @@
 
 #include "ash/ash_export.h"
 #include "base/callback.h"
-#include "base/memory/scoped_ptr.h"
 
 namespace base {
 class SequencedWorkerPool;
@@ -40,7 +41,7 @@ struct ASH_EXPORT ShellInitParams {
   // True if running inside mus.
   bool in_mus = false;
 
-  base::Callback<scoped_ptr<KeyboardUI>()> keyboard_factory;
+  base::Callback<std::unique_ptr<KeyboardUI>()> keyboard_factory;
 
 #if defined(OS_WIN)
   HWND remote_hwnd;