Move the PasswordGenerationManager to components

BUG=334641
TBR=avi@chromium.org

Review URL: https://codereview.chromium.org/184893002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254448 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254448