Bug 1438130 - Disable preloaded top websites suggestions in the Address Bar until ready. r=Gijs

This feature is confusing for Nightly users in its current state, and the
suggested websites, in foreign languages, may look worrisome to some.
Bug 1340663 must figure out these issues before re-enabling the feature.

MozReview-Commit-ID: 6RJ0Ff1B3AJ

--HG--
extra : rebase_source : 569b5ae833c4f5c05656522d0d9d0ad00679c370

modules/libpref/init/all.js

@@ -1188,11 +1188,8 @@ pref("browser.fixup.hide_user_pass", true);
 
 // Location Bar AutoComplete
 pref("browser.urlbar.autocomplete.enabled", true);
-#ifdef NIGHTLY_BUILD
-pref("browser.urlbar.usepreloadedtopurls.enabled", true);
-#else
+// This is disabled until Bug 1340663 figures out the remaining requirements.
 pref("browser.urlbar.usepreloadedtopurls.enabled", false);
-#endif
 pref("browser.urlbar.usepreloadedtopurls.expire_days", 14);
 
 // Print header customization