Add 'meta charset=UTF-8' to the html of an iframe interstitial  to prevent non-ASCII characters from being garbled. 
Add 'meta charset=UTF-8' to the html of an iframe interstitial  to prevent non-ASCII characters from being garbled. 

BUG=26030
TEST=1. Launch Chrome with --lang=pt-BR (ja or most languages other than English should work) on Windows or 'LANGUAGE=pt_BR chrome' on Linux.
2. Go to http://www.notalegal.df.gov.br/area=1248.htm and the iframe interstitial doesn't have a garbled character.
Review URL: http://codereview.chromium.org/348060

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@30988 0039d316-1c4b-4281-b951-d872f2087c98

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