Revert 242100 "Only allow enabling of ManagePasswordsBubble if U..."

> Only allow enabling of ManagePasswordsBubble if USE_AURA or WIN_OS is defined.
> 
> BUG=261628
> 
> Review URL: https://codereview.chromium.org/98643008

TBR=npentrel@chromium.org

Review URL: https://codereview.chromium.org/124743002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243042 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243042