Bug 1461785 - Update eslint ignore file to no longer ignore dom/media/mediasource. r=standard8

MozReview-Commit-ID: 5oveTiMuiH

--HG--
extra : rebase_source : 5cfbecc1191fee6402e9ae73837e301f5959c584

.eslintignore

@@ -218,8 +218,10 @@ dom/jsurl/**
 dom/locales/**
 dom/manifest/**
 dom/mathml/**
-dom/media/**
-!dom/media/*.js*
+dom/media/test/**
+dom/media/tests/**
+dom/media/webaudio/**
+dom/media/webspeech/**
 dom/messagechannel/**
 dom/midi/**
 dom/network/**