Revert 240927 "Disable the spring charger dialog on locked screen."

Re-enable the charger dialog on locked screen.

BUG=328965

> Disable the spring charger dialog on locked screen.
> 
> BUG=328449
> R=xiyuan@chromium.org
> 
> Review URL: https://codereview.chromium.org/113303004

TBR=jennyz@chromium.org

Review URL: https://codereview.chromium.org/116913002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241086 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241086