Bug 947583 - Fix "this.updateProviderURLs is not a function" when toggling "Block reported attack sites" preference r=dolske

From 8ba7cef13d00454ddcdec7e4f8eb32bcb6bee5ac Mon Sep 17 00:00:00 2001

toolkit/components/url-classifier/SafeBrowsing.jsm

@@ -35,7 +35,7 @@ this.SafeBrowsing = {
       return;
     }
 
-    Services.prefs.addObserver("browser.safebrowsing", this.readPrefs, false);
+    Services.prefs.addObserver("browser.safebrowsing", this.readPrefs.bind(this), false);
     this.readPrefs();
 
     // Register our two types of tables, and add custom Mozilla entries