Show system menu for popup windows on linux_aura
when the favicon is left clicked.

Added close menu for linux_aura to match linux_gtk.

BUG=285962
TEST=manual. see bug for repro step.

Review URL: https://codereview.chromium.org/114613004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242009 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242009