Use windows format in discovery results

Switches to using the windows format of the smb url (\\server\share) rather
than the smb://server/share format since it's more familiar to users.

Bug: chromium:889289
Change-Id: Ic9118980e05cf367b4049b426313408316472006
Reviewed-on: https://chromium-review.googlesource.com/c/1256112
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Scott Chen <scottchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596385}

chrome/browser/ui/webui/settings/chromeos/smb_handler.cc

@@ -26,7 +26,7 @@ smb_client::SmbService* GetSmbService(Profile* profile) {
 base::Value BuildShareList(const std::vector<smb_client::SmbUrl>& shares) {
   base::Value shares_list(base::Value::Type::LIST);
   for (const auto& share : shares) {
-    shares_list.GetList().push_back(base::Value(share.ToString()));
+    shares_list.GetList().push_back(base::Value(share.GetWindowsUNCString()));
   }
   return shares_list;
 }