Move GetVisibleNetworks network type filtering to WiFiService interface. 

Fix incorrect naming process_client => service_client, service_path => network_guid.

BUG=267667

Review URL: https://codereview.chromium.org/88653002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237460 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237460