chromeos: Replace base::Callback<void()> typedefs in CrosDisksClient with base::Closure

BUG=None
TEST=chromeos_unittests
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Review URL: https://codereview.chromium.org/18609003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@210118 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed