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A recent change to accessibility on Chrome OS is triggering a call to
MenuItemView::GetAccessibleState on a MenuItemView that has a delegate
but no command id, which asserts in MenuModelAdapter when we try to
look up a command that's not there.

The fix is to not call MenuModelAdapter::GetAccelerator to look up a
command when the command is zero.

BUG=230107,232079

Review URL: https://codereview.chromium.org/14161006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@194665 0039d316-1c4b-4281-b951-d872f2087c98