OneClickSigninBubbleView: Only show title if no error present.

For the error case:
- Hide the "You're now signed in to Chrome" title.
- Change "OK, got it!" to just "OK"

XIB changes:
- Connected the close (OK) button to the closeButton_ outlet, which was for some reason missing before.

Screenshots (disregard text of errors; samples were used):
- Mac: http://i.imgur.com/hPDAY8i.png
- Views: http://i.imgur.com/ZM9ktga.png
BUG=333988

Review URL: https://codereview.chromium.org/137563002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248618 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248618
Renames LauncherID, LauncherItem and LauncherItems...

to ShelfID, ShelfItem and ShelfItems.


BUG=248353
TEST=None
R=jamescook@chromium.org,harrym@chromium.org

Review URL: https://codereview.chromium.org/152223002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248619 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248619