Filter out native FSPs in Browser Tests

The FileSystemProviderApiTests assume that there are no native providers
and that the test extension is the only fsp. Once the SMB FSP is enabled,
this will no longer be the case so we need to explicitly filter out native
fsps in tests.

Bug: chromium:757625
Change-Id: I8ba9a8089d5b00aa8bfd3206ced9d60a4f2d05ce
Reviewed-on: https://chromium-review.googlesource.com/1195883
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587751}
2 files changed