In the translate infobars (the before and after ones), it was possible to select the original language to be the same as the target one. That would cause a DCHECK when the translation happens (in TranslateManager). We now prevent from selecting in the original combo the same language as the target language.
In the translate infobars (the before and after ones), it was possible to select the original language to be the same as the target one. That would cause a DCHECK when the translation happens (in TranslateManager).
We now prevent from selecting in the original combo the same language as the target language.

BUG=46727
TEST=Open a page in a language which is not the UI one (ex: www.google.de).
     You should not be able to select English as a language in the language
     menu in the translate infobar.

Review URL: http://codereview.chromium.org/2847016

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@50142 0039d316-1c4b-4281-b951-d872f2087c98

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