WebPluginSiteDataManager should use OwnPtr.
<http://webkit.org/b/111940>

Reviewed by Anders Carlsson.

* UIProcess/Plugins/WebPluginSiteDataManager.cpp:
(WebKit::WebPluginSiteDataManager::invalidate):
(WebKit::WebPluginSiteDataManager::getSitesWithData):
(WebKit::WebPluginSiteDataManager::clearSiteData):
(WebKit::WebPluginSiteDataManager::didGetSitesWithDataForAllPlugins):
(WebKit::WebPluginSiteDataManager::didClearSiteDataForAllPlugins):
* UIProcess/Plugins/WebPluginSiteDataManager.h:
(WebPluginSiteDataManager):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@145328 268f45cc-cd09-0410-ab3c-d52691b4dbfc