Vid 1773

addToList and trimVideoList were originally in use because we had the requirement to “fall through” to videos if we didn’t get enough of one type. That is, we’d start by getting a list of all the related videos for an article (we wanted 20 total), but if we only got 13, then we'd to backfill the other 7 with videos related to the vertical. But, those videos were supposed to draw from a bucket itself of 20 videos. Therefore, in a case like that addToList marshaled up to 20 videos, and then trimList would filter just 7 of those, adding them to our existingVideos array.

We don’t have that requirement anymore, and these methods don't work now that we need to get the video details before filtering (since we need the regional restriction information), so filtering videos is now being handled slightly differently.