Convert //ash from scoped_ptr to std::unique_ptr

ash/mus/sysui_application.h

Index: ash/mus/sysui_application.h
diff --git a/ash/mus/sysui_application.h b/ash/mus/sysui_application.h
index dba0f5e3dc28d611a985b4767c302f017fa3b96b..552f21080ed96052c94526d67c8ad968c72a8075 100644
--- a/ash/mus/sysui_application.h
+++ b/ash/mus/sysui_application.h
@@ -5,8 +5,9 @@
 #ifndef ASH_MUS_SYSUI_APPLICATION_H_
 #define ASH_MUS_SYSUI_APPLICATION_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "mojo/services/tracing/public/cpp/tracing_impl.h"
 #include "mojo/shell/public/cpp/shell_client.h"
 
@@ -28,7 +29,7 @@ class SysUIApplication : public mojo::ShellClient {
   bool AcceptConnection(mojo::Connection* connection) override;
 
   mojo::TracingImpl tracing_;
-  scoped_ptr<AshInit> ash_init_;
+  std::unique_ptr<AshInit> ash_init_;
 
   DISALLOW_COPY_AND_ASSIGN(SysUIApplication);
 };