Add methods for configuring website/content settings (fixes #3490)

This approach is now used to allow popups on a case-by-case basis in
tests instead of globally disabling the popup blocker with the Chrome
runtime.

cef_paths2.gypi

@@ -55,6 +55,7 @@
       'include/internal/cef_time.h',
       'include/internal/cef_trace_event_internal.h',
       'include/internal/cef_types.h',
+      'include/internal/cef_types_content_settings.h',
       'include/internal/cef_types_geometry.h',
     ],
     'includes_capi': [