[epiphany] Reenable PSON, but disable DNS prefetch temporarily

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 6a8aca6e3ed0e4ebdd81ac5fa648f76c8f67e9b9
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sat Nov 30 12:27:51 2019 -0600

    Reenable PSON, but disable DNS prefetch temporarily
    
    The crash we are trying to avoid only occurs when we perform a DNS
    prefetch with PSON enabled.
    
    https://bugs.webkit.org/show_bug.cgi?id=204703

 embed/ephy-embed-shell.c          | 2 +-
 lib/widgets/ephy-location-entry.c | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/embed/ephy-embed-shell.c b/embed/ephy-embed-shell.c
index 405471ef9..d95409719 100644
--- a/embed/ephy-embed-shell.c
+++ b/embed/ephy-embed-shell.c
@@ -760,7 +760,7 @@ ephy_embed_shell_create_web_context (EphyEmbedShell *shell)
 
   priv->web_context = g_object_new (WEBKIT_TYPE_WEB_CONTEXT,
                                     "website-data-manager", manager,
-                                    "process-swap-on-cross-site-navigation-enabled", FALSE, /* FIXME: 
https://bugs.webkit.org/show_bug.cgi?id=204703 */
+                                    "process-swap-on-cross-site-navigation-enabled", TRUE,
                                     NULL);
 
   if (priv->mode == EPHY_EMBED_SHELL_MODE_AUTOMATION)
diff --git a/lib/widgets/ephy-location-entry.c b/lib/widgets/ephy-location-entry.c
index 3eed89af4..79fdd0334 100644
--- a/lib/widgets/ephy-location-entry.c
+++ b/lib/widgets/ephy-location-entry.c
@@ -1045,8 +1045,11 @@ do_dns_prefetch (PrefetchHelper *helper)
 {
   EphyEmbedShell *shell = ephy_embed_shell_get_default ();
 
+/* FIXME: https://bugs.webkit.org/show_bug.cgi?id=204703 */
+#if WEBKIT_CHECK_VERSION(2, 27, 4)
   if (helper->uri)
     webkit_web_context_prefetch_dns (ephy_embed_shell_get_web_context (shell), helper->uri->host);
+#endif
 
   helper->entry->dns_prefetch_handler = 0;