Vendor prefixes appear to be on the way out. For experimental not-a-standard-yet kind of features, the preference seems to be a browser config switch like "chrome://flags". This is "a good thing" methinks.
True, but there is also a bit of irony to the request in hindsight because the main thrust of the argument was that the more heterogenous the browser market was, the better it would be for web standards.
However, after Google forked WebKit Opera adopted Blink as their rendering engine, making the whole situation basically a wash in the context of the original argument.
Blink is a fork of the entire WebKit repository. The lion's share of that is WebCore (especially after removing platform bindings that don't apply to Chromium), but it's entirely fine to call it a fork of WebKit.
Flash player(common denominator for all browsers) still runs in separate system process, so I does not look like overall security of web increased at all.
That's not big suprise tho, if you are required to have Adobe Flash player installed in order to use Youtube.
There is also entire advertisement ecosystem built by Google, which relies on flash player... and I don't mean ads here, but all the data about users which Google is harvesting through it thanks to Google Toolbar which is bundled with Flash player.