Make MenuItemView default constructible
Make MenuItemView's delegate an optional argument in its constructor so it can be default constructed. Its delegate can always be set thru the existing set_delegate() function. Also need to add a few more checks for the return delegate pointer. Bug: 1108460 Change-Id: Ie90709271c971cadccf3e13166df0c240d73dfca Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2321526Reviewed-by:Scott Violet <sky@chromium.org> Commit-Queue: Wei Li <weili@chromium.org> Cr-Commit-Position: refs/heads/master@{#792836}
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