Revert 242202 "Separating ManagePasswordsBubbleModel and -UICont..."

> Separating ManagePasswordsBubbleModel and -UIController. Moving code from the Model to the UIController.
> 
> BUG=261628
> 
> Review URL: https://codereview.chromium.org/103773004

TBR=npentrel@chromium.org

Review URL: https://codereview.chromium.org/121753003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243041 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243041