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We assumed that the file separator would be dependent on the
filesystem in the WPT manifest (so '\' on Windows), but the manifest
always uses '/', no matter what the platform. Change this code to
always split on '/'. This change also fixes a bug where WPT tests would
not run under virtual test suites on Windows.

Bug: 796424
Change-Id: Iea7466bc1208f9c8fd9938688c31029917944f77
Reviewed-on: https://chromium-review.googlesource.com/956662
Commit-Queue: Chris Nardi <cnardi@chromium.org>
Reviewed-by: Robert Ma <robertma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542166}