Fork renderer process for webview

Previously it was disabled because Chrome doesn't support swapping
renderer process before, it seeems to work fine now, so we enable it to
see how it goes.

atom/renderer/lib/init.coffee

@@ -29,8 +29,6 @@ for arg in process.argv
   if arg.indexOf('--guest-instance-id=') == 0
     # This is a guest web view.
     process.guestInstanceId = parseInt arg.substr(arg.indexOf('=') + 1)
-    # Set the frame name to make AtomRendererClient recognize this guest.
-    require('web-frame').setName 'ATOM_SHELL_GUEST_WEB_VIEW'
   else if arg.indexOf('--node-integration=') == 0
     nodeIntegration = arg.substr arg.indexOf('=') + 1
   else if arg.indexOf('--preload=') == 0