That's a pretty whiny feature request. I read the first few dozen comments, and I don't really know what exactly was being requested.
It's clear to me that the right approach is an extension specific to your preferred RSS reader. I understand that some browsers have an RSS reader built it, but that still doesn't make it a core feature that's going to be used by a big portion of their users.
This feature request asks for two things to be native in chromium:
1. have an indicator in the browser interface that an rss feed is available for the current page.
2. have a preview of rss feeds rather than unstyled xml. It is just a matter of adding style for some xml files the way shiira[1] first did or the way safari[2], opera[3] or firefox do.
It is clear to me that the second is nice for the user even if the chromium developpers do not intend to implement a full rss reader as it just consists in making some common web documents readable directly in the browser, it is far more logical for a web browser to display rss than to display pdf... The first point is said to distract the user and clutter the interface so I can understand why it should be an extension (firefox voluntarily suppressed this indicator a few years ago).
It's clear to me that the right approach is an extension specific to your preferred RSS reader. I understand that some browsers have an RSS reader built it, but that still doesn't make it a core feature that's going to be used by a big portion of their users.