Gave native File Browser file handlers higher priority than 3rd party handlers.

chrome/browser/chromeos/extensions/file_manager_util.cc

Index: chrome/browser/chromeos/extensions/file_manager_util.cc
diff --git a/chrome/browser/chromeos/extensions/file_manager_util.cc b/chrome/browser/chromeos/extensions/file_manager_util.cc
index ea584bb4f02b33492bca6f730a1654af78390fc3..590466e585778a0e5e9bc6b55c75038835eb91b0 100644
--- a/chrome/browser/chromeos/extensions/file_manager_util.cc
+++ b/chrome/browser/chromeos/extensions/file_manager_util.cc
@@ -366,7 +366,8 @@ bool TryOpeningFileBrowser(const FilePath& full_path) {
     return false;
 
   const FileBrowserHandler* handler;
-  if (!file_handler_util::GetDefaultTask(browser->profile(), url, &handler))
+  if (!file_handler_util::GetDefaultTask(
+      browser->profile(), url, kFileBrowserDomain, &handler))
     return false;
 
   std::string extension_id = handler->extension_id();