Roll NSS from 253292:254867

Pulls in 1 change:
  r254867: Add PK11_GetKeyLength to NSS exports.

BUG=245025
R=rsleevi@chromium.org

Review URL: https://codereview.chromium.org/187153002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255071 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255072 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255072