Chrome UI language menu fix and add Hawaiian to the A-L list.

UI language list fix.

30+ minimally populated locales were added to our ICU data. As a result, GetAvailableLocale() used whenconstructing the UI language menu in Chrome list languages Chrome is not localized to. 

1. Add IsPartiallyPopulatedLocale() to l10n_util (anonymous namespace) and skip those locales when constructing the locale list. 

2. Add 'Hawaiian', 'Oromo' and 'Hausa' to the Accept-Language list. I'll add other languages to the trunk later. 

BUG=21119
(http://crbug.com/21119), 19329 ( http://crbug.com/19329 )
TEST=1. Launch Chrome and go to Options | "Advanced" | Languages & Fonts menu | Languages tab | Google Chrome language. The list of languages to choose from should contain only languages Chrome is localized to (40 + 1 + 8) and should not contain languages like Hawaian, Belarusian. 
2. Accept-Language list should contain 3 new languages added (Hawaiian, Oromo and Hausa)

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=26230

[jungshik at Google, 2009-09-14 23:02:26]

I forgot to press 'the publish button' for this while the branch CL was reviewed
and landed more than a week ago. 

This does the same thing as the branch CL
(http://codereview.chromium.org/192029),  but the trunk moved on so that it's
textually different from the branch patch.

In addition, unlike the branch, two more languages are added to the
Accept-Language list (Oromo and Hausa) for which we have the locale data we
need.

[tony, 2009-09-14 23:11:13]

I see, LGTM