Bug 1109831 - move testing/profiles/ files to moz.build's TEST_HARNESS_FILES; r=mshal
Bug 1109826 - part 0a - uncomment preprocessing directives in ImportExport.jsm; r=fabrice

Apparently, these directives should have been uncommented prior to landing.
Bug 1109826 - part 0b - don't preprocess content-contextmenu.svg for browser/ themes; r=mshal
Bug 1109826 - part 0c - don't preprocess aboutPrivateBrowsing.js; r=mshal
Bug 1109826 - part 1 - make the preprocessor able to avoid emitting warnings about missing directives; r=mshal
Bug 1109826 - part 2 - don't complain about missing directives for PREF_JS_EXPORTS and DIST_FILES; r=mshal
Bug 1109826 - part 3 - don't complain about missing directives for browser/ search plugins; r=mshal