Clean-up GlobalDAO (WhiteURIList)

Clean-up GlobalDAO (WhiteURIList)

[Issue#]   LINUXWRT-1029
[Problem]  GlobalDAO has unnecessary API.
[Cause]    N/A
[Solution] Remove "WhiteURIList" API
           - "WhiteURIList" stores uri to allow using plugin even uri is external uri.(http, https)
           - Moreover, tizen plugin doesn't have plan to support tizen web api to external uri.
           - Current usage case is checking "WhiteURIList" before load plugin object to JS engine.
[Verification] Checking plugin object is available in external page
[SCMRequest] N/A

Change-Id: Ib35ec9a13babb31a50a9a8b8835d8ee8eebaee85