Reland: Linux (nss) implementations of RSAPrivateKey and SignatureCreator.

This relands: http://codereview.chromium.org/208032.

Additionally, it fixes a memleak unconvered by valgrind, and adds a valgrind supression for a memleak discovered in the nss library. https://bugzilla.mozilla.org/show_bug.cgi?id=518443

BUG=20669

Review URL: http://codereview.chromium.org/218010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@27033 0039d316-1c4b-4281-b951-d872f2087c98
7 files changed