Treat kFileSystemTypeDriveFs as a native filesystem type.

Bug: 874314
Change-Id: I214166c74e78eed59eb6bda0ac0bcdf1992daa3c
Reviewed-on: https://chromium-review.googlesource.com/1186020Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585404}

chrome/browser/chromeos/file_manager/filesystem_api_util.cc

@@ -129,6 +129,7 @@ bool IsNonNativeFileSystemType(storage::FileSystemType type) {
   switch (type) {
     case storage::kFileSystemTypeNativeLocal:
     case storage::kFileSystemTypeRestrictedNativeLocal:
+    case storage::kFileSystemTypeDriveFs:
       return false;
     default:
       // The path indeed corresponds to a mount point not associated with a