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The only functional change is to drop the `profile_` property from the
CannedBrowsingDataFileSystemHelper, which just stored it without ever
touching it.  I don't like keeping pointers around if I don't need them, so
I'm dropping it here.

BUG=None
TEST=Read the code. Can you understand it?


Review URL: http://codereview.chromium.org/7104026

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@88647 0039d316-1c4b-4281-b951-d872f2087c98