onSavePassword dialog can leak when WebViewClassic is destroyed.

The AlertDialog creates in onSavePassword method leaks if
WebViewClassic is destroyed when the dialog is shown.

Change-Id: I81f20e1dd138467a6413766c0a081b389b334ae0
If frameworks wants ASCII casing, it should explicity ask for it.

http://elliotth.blogspot.com/2012/01/beware-convenience-methods.html

Bug: https://code.google.com/p/android/issues/detail?id=58359
Change-Id: Iaab02e718a7be7bda22e626dca05d79bfd2a8fc4
Merge changes Iaab02e71,I81f20e1d into jb43

* changes:
  If frameworks wants ASCII casing, it should explicity ask for it.
  onSavePassword dialog can leak when WebViewClassic is destroyed.