Bug 847600 - Remove SVGEvent, r=jwatt

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extra : rebase_source : 5b9452c1757b2cec02d469337ae3876a554f0081
Bug 823285 - Use foreground notification service for downloads. r=kats

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extra : rebase_source : 004e31f0379819c5f72420223b24ed0ceccb2e2e