Convert //chrome/browser/ui from scoped_ptr to std::unique_ptr

chrome/browser/ui/webui/signin/signin_create_profile_handler.cc

Index: chrome/browser/ui/webui/signin/signin_create_profile_handler.cc
diff --git a/chrome/browser/ui/webui/signin/signin_create_profile_handler.cc b/chrome/browser/ui/webui/signin/signin_create_profile_handler.cc
index d0d86401dcc8c31a0def07ebc468006e6013969c..079328aa54ea562e2f36d105913fd8b4174136ea 100644
--- a/chrome/browser/ui/webui/signin/signin_create_profile_handler.cc
+++ b/chrome/browser/ui/webui/signin/signin_create_profile_handler.cc
@@ -170,7 +170,8 @@ void SigninCreateProfileHandler::RequestSignedInProfiles(
     if (username.empty())
       continue;
     base::string16 profile_path = entry->GetPath().AsUTF16Unsafe();
-    scoped_ptr<base::DictionaryValue> user_info(new base::DictionaryValue());
+    std::unique_ptr<base::DictionaryValue> user_info(
+        new base::DictionaryValue());
     user_info->SetString("username", username);
     user_info->SetString("profilePath", profile_path);