of HtmlDialogView.

Added TODO to fix inaccurate font height metric for OS X font class (and maybe width).

Added the BrowserCommandExecutor protocol so that not just a
BrowserWindowController can be the window controller for a
ChromeEventProcessingWindow.

Added unittests.  Also tested manually with the bookmark sync setup
wizard dialog.

BUG=23073
TEST=added unittests, trybot, and manual testing

Review URL: http://codereview.chromium.org/344008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@30619 0039d316-1c4b-4281-b951-d872f2087c98