Implement signature_creator_mac. Also moved CSSM memory functions to a common shared location.

BUG=20669

Review URL: http://codereview.chromium.org/259026

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@28135 0039d316-1c4b-4281-b951-d872f2087c98
7 files changed