Convert a bunch more of importer into FilePath.

I thought this would be a small job but I pulled the thread
and it kept coming.  :(

BUG=24672

Review URL: http://codereview.chromium.org/650034

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@39610 0039d316-1c4b-4281-b951-d872f2087c98
9 files changed