Revert "Add option to use your own Youtube API key. #2327"

This reverts commit c7ce6187f2c601fc9daa9f1b4c6dea0c0375db69.

src/General/Settings/Advanced.html

@@ -59,12 +59,6 @@
   </div>
 </fieldset>
 
-<fieldset>
-  <legend>Youtube API Key</legend>
-  <div>API key used to fetch Youtube link titles. You can obtain your own key <a href="https://console.cloud.google.com/marketplace/details/google/youtube.googleapis.com" target="_blank">here</a> to make the feature work when the default key exceeds its quota.</div>
-  <div><input name="youtubeAPIKey" class="field" spellcheck="false"></div>
-</fieldset>
-
 <fieldset>
   <legend>Custom Board Navigation</legend>
   <div><textarea hidden name="boardnav" class="field" spellcheck="false"></textarea></div>

src/Linkification/Embedding.coffee

@@ -548,7 +548,7 @@ Embedding =
         ignore403: true
         api: (uids) ->
           ids = encodeURIComponent uids.join(',')
-          key = Conf['youtubeAPIKey']
+          key = '<%= meta.youtubeAPIKey %>'
           "https://www.googleapis.com/youtube/v3/videos?part=snippet&id=#{ids}&fields=items%28id%2Csnippet%28title%29%29&key=#{key}"
         text: (data, uid) ->
           for item in data.items when item.id is uid

src/config/Config.coffee

@@ -1181,5 +1181,3 @@ Config =
   passMessageClosed: false
 
   'Prerequest Captcha': false
-
-  youtubeAPIKey: '<%= meta.youtubeAPIKey %>'