Included text/css content type into list of the supported non image files. ...

Included text/css content type into list of the supported non image files. 
Now css files are opened inside browser instead of download.
Also - making lint happy on the mime_util.cc

BUG=7192

[yurig, 2009-06-11 21:05:27]

There is a bug caused by relative recent "text/csv"
(http://codereview.chromium.org/18349) patch:
CSS files are served for download with saving dialog - this is an annoying thing
for web developers (http://code.google.com/p/chromium/issues/detail?id=7192)

As a quick and working solution I included "text/css" content type into list of
supported non image mime types. That solves the problem.

[abarth-chromium, 2009-06-11 21:41:21]

Ok.  We can change our behavior here.  LGTM after you address my comment below.

http://codereview.chromium.org/125005/diff/1/3
File webkit/glue/mimetype_unittest.cc (right):

http://codereview.chromium.org/125005/diff/1/3#newcode47
Line 47: "text/css",
Please leave the comment in.  Explain that we choose to match Firefox, and link
to the bug.  :)

[yurig, 2009-06-11 22:25:09]

I've updated patch with explanation comments. Please commit if it's acceptable.

[yurig, 2009-06-12 05:36:03]

Adam, I've signed  "Google Individual Contributor License Agreement" and
included myself into AUTHORS as requested

[abarth-chromium, 2009-06-12 06:47:33]

On 2009/06/12 05:36:03, yurig wrote:
> Adam, I've signed  "Google Individual Contributor License Agreement" and
> included myself into AUTHORS as requested

Awesome.  Thanks.  I'll land this for you tomorrow.

Adam

[abarth-chromium, 2009-06-12 20:00:48]

Landed in http://src.chromium.org/viewvc/chrome?view=rev&revision=18306.