If the user runs chrome with a language on the command line on first-run, make sure we pass that language to the importer process.
If the user runs chrome with a language on the command line on
first-run, make sure we pass that language to the importer process.

The code for this is basically a copy of what is in
chrome/browser/render_process_host.cc:291.

TEST=Run "chrome --lang=ko --first-run" and import settings during first
  run.  Make sure the importer dialog is in Korean.


git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@673 0039d316-1c4b-4281-b951-d872f2087c98

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