Migrate CandidateWindow::Entry to string16.

BUG=329604

Review URL: https://codereview.chromium.org/162723003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251032 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251032
Add function to support clearing SSL/certificate store.

When smartcard auth is disabled we need to wipe the store and any open
sockets. By issuing a NULL cert being added this happens.

BUG=341500

Review URL: https://codereview.chromium.org/161653002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251033 0039d316-1c4b-4281-b951-d872f2087c98
Add a landmine to get rid of obselete test netscape plugins

BUG=331302
R=marja@chromium.org

Review URL: https://codereview.chromium.org/163073002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251034 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251034