Rewrite simple uses of base::ListValue::Append() taking a raw pointer var.

extensions/browser/api/web_request/upload_data_presenter.cc

Index: extensions/browser/api/web_request/upload_data_presenter.cc
diff --git a/extensions/browser/api/web_request/upload_data_presenter.cc b/extensions/browser/api/web_request/upload_data_presenter.cc
index e9584c32787e32f784083101cce8fb3fbe833b1f..dbc6c9147432e21fa68b557e1ec214c7f3846c19 100644
--- a/extensions/browser/api/web_request/upload_data_presenter.cc
+++ b/extensions/browser/api/web_request/upload_data_presenter.cc
@@ -46,9 +46,9 @@ namespace subtle {
 void AppendKeyValuePair(const char* key,
                         base::Value* value,
                         base::ListValue* list) {
-  base::DictionaryValue* dictionary = new base::DictionaryValue;
+  std::unique_ptr<base::DictionaryValue> dictionary(new base::DictionaryValue);
   dictionary->SetWithoutPathExpansion(key, value);
-  list->Append(dictionary);
+  list->Append(std::move(dictionary));
 }
 
 }  // namespace subtle