Specify new methods for supporting SSL client authentication.
See the changes to url_request.h and ssl_cert_request_info.h.

They are similar to the methods for handling SSL certificate
errors and HTTP authentication.

The handling of servers that request but don't require SSL
client authentication is reimplemented using the new methods.

R=rvargas,eroman
BUG=http://crbug.com/318
TEST=none
Review URL: http://codereview.chromium.org/118039

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@18322 0039d316-1c4b-4281-b951-d872f2087c98
25 files changed