[Mac] Hook up the "Remove" button in the collected cookies dialog.

This also resurrects the CookiesTreeModelObserverBridge (now called
CookiesTreeControllerBridge) that I removed in r77477 along with the rest of
the native preferences. The class is used to dynamically update the tree view
in response to model changes.

XIB changes:
* Made the "Blocked" tab buttons use the constrained window style.
* Matched the height of the NSOutlineView between the allowed and blocked tabs.

BUG=168996
TEST=Go to google.com, click on the lock icon, click on "Show cookies", and remove site data from the Allowed pane.

Review URL: https://codereview.chromium.org/128673002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243633 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243633