Convert //ash from scoped_ptr to std::unique_ptr

ash/shell/content/client/shell_main_delegate.h

Index: ash/shell/content/client/shell_main_delegate.h
diff --git a/ash/shell/content/client/shell_main_delegate.h b/ash/shell/content/client/shell_main_delegate.h
index 98bc44d120d6e7b6203734af5eb14b4336930d3a..a7bd2c98a81b9c644a3d0c9b85c947e4a9aec4a2 100644
--- a/ash/shell/content/client/shell_main_delegate.h
+++ b/ash/shell/content/client/shell_main_delegate.h
@@ -5,9 +5,10 @@
 #ifndef ASH_SHELL_CONTENT_CLIENT_SHELL_MAIN_DELEGATE_H_
 #define ASH_SHELL_CONTENT_CLIENT_SHELL_MAIN_DELEGATE_H_
 
+#include <memory>
+
 #include "base/compiler_specific.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "content/public/app/content_main_delegate.h"
 #include "content/shell/common/shell_content_client.h"
 
@@ -33,7 +34,7 @@ class ShellMainDelegate : public content::ContentMainDelegate {
  private:
   void InitializeResourceBundle();
 
-  scoped_ptr<ShellContentBrowserClient> browser_client_;
+  std::unique_ptr<ShellContentBrowserClient> browser_client_;
   content::ShellContentClient content_client_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellMainDelegate);