Skip fast/forms/select/listbox-in-multi-column.html

I'm investigating the flakiness. According blink-dev discussion we
should skip flaky tests instead of marking them flaky.

Bug: 798116
Change-Id: I9d2fcf31ab2475169c97108bc0d2c02c242c7658
TBR: battre@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/848274Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526744}

third_party/WebKit/LayoutTests/TestExpectations

@@ -3009,7 +3009,7 @@ crbug.com/734762 inspector-protocol/timeline/page-frames.js [ Failure ]
 crbug.com/736255 [ Mac ] external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-baseline-multi-item-vert-001b.html [ Skip ]
 crbug.com/736732 virtual/enable_wasm/external/wpt/wasm/wasm_local_iframe_test.html [ Timeout Pass ]
 
-crbug.com/798116 [ Linux Win7 ] fast/forms/select/listbox-in-multi-column.html [ Failure Pass ]
+crbug.com/798116 [ Win7 ] fast/forms/select/listbox-in-multi-column.html [ Skip ]
 
 # These imported tests exercise tens of thousands of code points and generate large results. Marked slow, but still timeout.
 crbug.com/736056 [ Mac ] external/wpt/encoding/legacy-mb-japanese [ Timeout Pass ]