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Improves a code block in in_process_browser_test, avoids the use of FilePath::FromWStringHack and the use of a deprecated function.

Patch by tfarina.

BUG=None
TEST=run browser_tests.exe 

Review URL: http://codereview.chromium.org/192035


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@25881 0039d316-1c4b-4281-b951-d872f2087c98