Try to fix more Javascript strict problems

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branch : 36.0a1
Temporarily disable compact header specific other action button

--HG--
branch : 36.0a1
Remove obsolete files for old versions of Thunderbird

--HG--
branch : 36.0a1
Other cleanup work for 37.0

--HG--
branch : 36.0a1
rename : chrome/CompactHeader/content/compactHeaderOverlay-36.xul => chrome/CompactHeader/content/compactHeaderOverlay.xul