Bug 1073117 - Add new GTK_STATE_FLAG_CHECKED for checkbox rendering. r=karlt
Bug 1073117 - [gtk3] Use GTK_STYLE_CLASS_VIEW style for selected text rendering. r=karlt

It also merges some duplicated colors and adds GTK_STATE_FLAG_FOCUSED for selected text.
Bug 1106050 - Fix variable ‘fifoCallbacksRegistered’ set but not used warning. r=njn
Bug 1107264 - Enable the use of FFmpeg on mac. r=k17e