Switch to the MacViews version of the cert viewer.

There was a Cocoa and MacViews version with a common superclass;
this removes the Cocoa version and folds the superclass into the
MacViews subclass which is the only one that remains.

This also reverts 027233cd43df4596af6b3ba501a15090f1284c05 as
that hack was only needed while we linked against the 10.10 SDK
and we no longer do so.

BUG=891699

Change-Id: Iefdd30268f1e0b52ee1ecd71bdb252e5b8b5c631
Reviewed-on: https://chromium-review.googlesource.com/c/1277578
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599663}
8 files changed