remove leak WaitResult List in startActivityMayWait

Change-Id: If169ef4474a6a38eb2957c806c6e7f8f7ce67783
Signed-off-by: Young-ho Cha <ganadist@gmail.com>
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