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This is a modified due to the regression caused by
https://codereview.chromium.org/415343003/. The test case now checks the
number of items in the menu list to not include items with "display: none"

[1] https://codereview.chromium.org/475723002/ patch that fixes the regression.

BUG=398051,403299
R=tkent

Review URL: https://codereview.chromium.org/475733002

Cr-Commit-Position: refs/heads/master@{#293119}