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A "raw" test type in MB was a test executable that didn't conform to
one of the other supported test harness APIs (like the chromium
gtest api or the test executable API), and which we would
handle by simply running the executable and returning the status
code.

There was no real need to support this directly; it turns out
that every raw test that we current run should've either actually
been a gtest-based test or was handled by a generated wrapper
(for the ChromeOS Tast-based tests).

Fixing this and removing support for "raw" test types allows us
to simplify MB a bit but more importantly gets us one step
closer to having only one supported API for tests.

Bug: 816629
Change-Id: I831efa949614719a8aa5106c5ab5c1c0c48b5059
Cq-Include-Trybots: luci.chromium.try:linux_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2380439
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808606}