Other cleanup work for 37.0

--HG--
branch : 36.0a1
rename : chrome/CompactHeader/content/compactHeaderOverlay-36.xul => chrome/CompactHeader/content/compactHeaderOverlay.xul
Moved tag github/branch36.0a1 to changeset 290d2ce7fc8e (from changeset 609ed45b6881)

--HG--
branch : 36.0a1