Alt+Space should always bring up the Window context menu on Windows
Alt+Space should always bring up the Window context menu on Windows

The problem is when Alt+Space is pressed when a Link view is focused this
will result in openning the link, since space is used to open the link. We
only allow this behavior if the Alt modifier is not pressed.

BUG=428639

Review URL: https://codereview.chromium.org/1373163004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#351633}

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