Reland: Stop passing raw pointers to base::Value API in c/b/chromeos and c/b/extensions

chrome/browser/chromeos/file_manager/url_util.cc

Index: chrome/browser/chromeos/file_manager/url_util.cc
diff --git a/chrome/browser/chromeos/file_manager/url_util.cc b/chrome/browser/chromeos/file_manager/url_util.cc
index 8303a3228bbd247120869297b44c9316f40f571e..acd9df5c6b953c38adac967645533178cddb33eb 100644
--- a/chrome/browser/chromeos/file_manager/url_util.cc
+++ b/chrome/browser/chromeos/file_manager/url_util.cc
@@ -88,7 +88,7 @@ GURL GetFileManagerMainPageUrlWithParams(
   if (file_types) {
     auto types_list = base::MakeUnique<base::ListValue>();
     for (size_t i = 0; i < file_types->extensions.size(); ++i) {
-      base::ListValue* extensions_list = new base::ListValue();
+      auto extensions_list = base::MakeUnique<base::ListValue>();
       for (size_t j = 0; j < file_types->extensions[i].size(); ++j) {
         extensions_list->AppendString(file_types->extensions[i][j]);
       }