[epiphany] filters-manager: Fix misuse of GCancellable

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 503155111ae77dd83c62f37ca9fa056bba12ac86
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Mon Jan 23 20:13:47 2017 -0600

    filters-manager: Fix misuse of GCancellable
    
    This completely broke the adblocker.

 lib/ephy-filters-manager.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/lib/ephy-filters-manager.c b/lib/ephy-filters-manager.c
index 989414f..8067560 100644
--- a/lib/ephy-filters-manager.c
+++ b/lib/ephy-filters-manager.c
@@ -235,8 +235,10 @@ update_adblock_filter_files (EphyFiltersManager *manager)
   if (!g_settings_get_boolean (EPHY_SETTINGS_WEB, EPHY_PREFS_WEB_ENABLE_ADBLOCK))
     return;
 
-  /* One at a time please! */
+  /* Only once at a time please! Newest set of filters wins. */
   g_cancellable_cancel (manager->cancellable);
+  g_object_unref (manager->cancellable);
+  manager->cancellable = g_cancellable_new ();
 
   filters = g_settings_get_strv (EPHY_SETTINGS_WEB, EPHY_PREFS_WEB_ADBLOCK_FILTERS);
   for (guint i = 0; filters[i]; i++) {