net: add Baltimore CyberTrust Root to the twitterCDN pinning set.

This was previously an intermediate but has been promoted to a root in some
root stores. This is causing chain truncation and pinning mismatches for, at
least, twimg0-a.akamaihd.net.

BUG=285472
R=cbentzel@chromium.org

Review URL: https://codereview.chromium.org/68113025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235165 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 235165
Mojo: Add a MOJO_ARRAYSIZE, corresponding to Chromium's arraysize.

(Like the other things in the file, so that mojo/public doesn't have to
depend on base.)

R=darin@chromium.org, davemoore

Review URL: https://codereview.chromium.org/70273009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235166 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 235166