Revert of [Mac] Unselect generated password when mouse leaves password bounds.

Revert of [Mac] Unselect generated password when mouse leaves password bounds. (https://codereview.chromium.org/282093006/)

Reason for revert:
Speculative revert, FormFillLatencyAfterSubmit is failing

Original issue's description:
> [Mac] Unselect generated password when mouse leaves password bounds.
> 
> In the Mac implementation of the password generation poup, the password
> row is not unselected when the mouse is moved elsewhere in the popup
> (e.g. over top of the help text).
> 
> The fix is that PasswordSelected() should always be called in
> SetSelectionAtPoint, not just when the mouse is within the password
> bounds. The Views implementation happens to work because it has a
> subview (PasswordRow) which triggers OnMouseExited() when the mouse
> moves outside of the password bounds.
> 
> Also added an optimization that PasswordSelectionUpdated() is only
> called when the value is actually changed, not every time
> PasswordSelected() is called.
> 
> BUG=114092
> R=isherman@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=270975

TBR=gcasto@chromium.org,isherman@chromium.org,dubroy@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=114092
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=271001

[Adrian Kuegel, 2014-05-16 12:21:33]

Created Revert of [Mac] Unselect generated password when mouse leaves password
bounds.

[commit-bot: I haz the power, 2014-05-16 12:21:57]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/akuegel@chromium.org/287063007/1

[commit-bot: I haz the power, 2014-05-16 12:23:26]

Change committed as 271001