Add baked-in favicons for default popular sites on NTP

components/ntp_tiles/resources/default_popular_sites.json

-[
-  {
-    "title": "Facebook - Log In or Sign Up",
-    "url": "https://m.facebook.com/",
-    "large_icon_url": "https://static.xx.fbcdn.net/rsrc.php/v3/ya/r/O2aKM2iSbOw.png"
-  },
-  {
-    "title": "YouTube",
-    "url": "https://m.youtube.com/",
-    "large_icon_url": "https://s.ytimg.com/yts/mobile/img/apple-touch-icon-144x144-precomposed-vflwq-hLZ.png"
-  },
-  {
-    "title": "Amazon.com: Online Shopping for Electronics, Apparel, Computers, Books, DVDs \u0026 more",
-    "url": "https://www.amazon.com/",
-    "large_icon_url": "https://images-na.ssl-images-amazon.com/images/G/01/anywhere/a_smile_196x196._CB368246573_.png"
-  },
-  {
-    "title": "Wikipedia, the free encyclopedia",
-    "url": "https://en.m.wikipedia.org/",
-    "large_icon_url": "https://en.m.wikipedia.org/static/apple-touch/wikipedia.png"
-  },
-  {
-    "title": "ESPN: The Worldwide Leader in Sports",
-    "url": "http://www.espn.com/",
-    "large_icon_url": "http://a.espncdn.com/wireless/mw5/r1/images/bookmark-icons/espn_icon-152x152.min.png"
-  },
-  {
-    "title": "Yahoo",
-    "url": "https://www.yahoo.com/",
-    "large_icon_url": "https://s.yimg.com/dh/ap/default/130909/y_200_a.png"
-  },
-  {
-    "title": "Instagram",
-    "url": "https://www.instagram.com/",
-    "large_icon_url": "https://instagramstatic-a.akamaihd.net/h1/images/ico/favicon-192.png/b407fa101800.png"
-  },
-  {
-    "title": "Electronics, Cars, Fashion, Collectibles, Coupons and More | eBay",
-    "url": "http://m.ebay.com/",
-    "large_icon_url": "http://ir.ebaystatic.com/pictures/aw/pics/mobile/images/apple-touch-icon.png"
-  }
-]
+[{"url":"https://m.facebook.com/","large_icon_url":"https://static.xx.fbcdn.net/rsrc.php/v3/ya/r/O2aKM2iSbOw.png","title":"Facebook - Log In or Sign Up"},{"url":"https://m.youtube.com/","large_icon_url":"https://s.ytimg.com/yts/mobile/img/apple-touch-icon-144x144-precomposed-vflwq-hLZ.png","title":"YouTube"},{"url":"https://www.amazon.com/","large_icon_url":"https://images-na.ssl-images-amazon.com/images/G/01/anywhere/a_smile_196x196._CB368246573_.png","title":"Amazon.com: Online Shopping for Electronics, Apparel, Computers, Books, DVDs & more"},{"url":"https://en.m.wikipedia.org/","large_icon_url":"https://en.m.wikipedia.org/static/apple-touch/wikipedia.png","title":"Wikipedia, the free encyclopedia"},{"url":"http://www.espn.com/","large_icon_url":"http://a.espncdn.com/wireless/mw5/r1/images/bookmark-icons/espn_icon-152x152.min.png","title":"ESPN: The Worldwide Leader in Sports"},{"url":"https://www.yahoo.com/","large_icon_url":"https://s.yimg.com/dh/ap/default/130909/y_200_a.png","title":"Yahoo"},{"url":"https://www.instagram.com/","large_icon_url":"https://instagramstatic-a.akamaihd.net/h1/images/ico/favicon-192.png/b407fa101800.png","title":"Instagram"},{"url":"http://m.ebay.com/","large_icon_url":"http://ir.ebaystatic.com/pictures/aw/pics/mobile/images/apple-touch-icon.png","title":"Electronics, Cars, Fashion, Collectibles, Coupons and More | eBay"}]

[sfiera, 2017/02/27 11:42:20]

Could we make this different from the internal version of the file? If we update
that one but keep this one the same, it will be confusing.

Some possible URLs:
https://www.chromium.org/
https://codereview.chromium.org/
https://chromium.googlesource.com/
https://developers.google.com/open-source/
https://freenode.net/
https://github.com/chromium/

Actually, I think it would be a fun mini-project to make a bunch of fake sites
that have features we want to test on the NTP, but I won't do that any time soon
:)

[fhorschig, 2017/02/28 13:13:12]

Okay. I think pretty-printed sites are more appropriate then, too.
I quickly added some sites (with different properties).