[vala/0.40] webkit2gtk-4.0: Cherry-pick some fixes from 0.42

[Rico Tzschichholz <ricotz src gnome org>]

commit 30f5de978e55eee7c08cd0cdfaf900640edf7231
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Tue May 1 19:43:26 2018 +0200

    webkit2gtk-4.0: Cherry-pick some fixes from 0.42

 vapi/webkit2gtk-4.0.vapi |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/vapi/webkit2gtk-4.0.vapi b/vapi/webkit2gtk-4.0.vapi
index 6696d15..43c2e9d 100644
--- a/vapi/webkit2gtk-4.0.vapi
+++ b/vapi/webkit2gtk-4.0.vapi
@@ -67,15 +67,15 @@ namespace WebKit {
        public class BackForwardList : GLib.Object {
                [CCode (has_construct_function = false)]
                protected BackForwardList ();
-               public unowned WebKit.BackForwardListItem get_back_item ();
+               public unowned WebKit.BackForwardListItem? get_back_item ();
                public GLib.List<weak WebKit.BackForwardListItem> get_back_list ();
                public GLib.List<weak WebKit.BackForwardListItem> get_back_list_with_limit (uint limit);
-               public unowned WebKit.BackForwardListItem get_current_item ();
-               public unowned WebKit.BackForwardListItem get_forward_item ();
+               public unowned WebKit.BackForwardListItem? get_current_item ();
+               public unowned WebKit.BackForwardListItem? get_forward_item ();
                public GLib.List<weak WebKit.BackForwardListItem> get_forward_list ();
                public GLib.List<weak WebKit.BackForwardListItem> get_forward_list_with_limit (uint limit);
                public uint get_length ();
-               public unowned WebKit.BackForwardListItem get_nth_item (int index);
+               public unowned WebKit.BackForwardListItem? get_nth_item (int index);
                public signal void changed (WebKit.BackForwardListItem? item_added, void* items_removed);
        }
        [CCode (cheader_filename = "webkit2/webkit2.h", type_id = "webkit_back_forward_list_item_get_type 
()")]
@@ -406,7 +406,7 @@ namespace WebKit {
        public class NetworkProxySettings {
                [CCode (has_construct_function = false)]
                [Version (since = "2.16")]
-               public NetworkProxySettings (string? default_proxy_uri, string? ignore_hosts);
+               public NetworkProxySettings (string? default_proxy_uri, [CCode (array_length = false, 
array_null_terminated = true)] string[]? ignore_hosts);
                [Version (since = "2.16")]
                public void add_proxy_for_scheme (string scheme, string proxy_uri);
                [Version (since = "2.16")]