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The "PROP" pattern match checks and other checks except for "TREE"
are currently broken and it's somewhat difficult to make them workable.
It would be easier to check AST nodes directly. This CL drops "PROP"
checks and adds some unittests. Follow-up CLs will remove other checks
except for "TREE".

BUG=617899

Change-Id: Ifb7041ab971fc584b0a43e8ce465e2e30905f9d4
Reviewed-on: https://chromium-review.googlesource.com/581129Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488690}