Fix memory leak from use of SECKEY_ConvertToPublicKey().

BUG=347965,245025

Review URL: https://codereview.chromium.org/184753002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254202 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254202
Disable a flaky test.

TBR=hirono@chromium.org
BUG=348008

Review URL: https://codereview.chromium.org/184513003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254204 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254204