Bug 1329808 - Enable V4 completions in Nightly but ignore the result …

…r=francois

MozReview-Commit-ID: 75JzdJ4ceS4

modules/libpref/init/all.js

@@ -5208,8 +5208,11 @@ pref("browser.safebrowsing.provider.google.reportMalwareMistakeURL", "https://%L
 pref("browser.safebrowsing.provider.google4.pver", "4");
 pref("browser.safebrowsing.provider.google4.lists", "goog-badbinurl-proto,goog-downloadwhite-proto,goog-phish-proto,googpub-phish-proto,goog-malware-proto,goog-unwanted-proto");
 pref("browser.safebrowsing.provider.google4.updateURL", "https://safebrowsing.googleapis.com/v4/threatListUpdates:fetch?$ct=application/x-protobuf&key=%GOOGLE_API_KEY%");
-// Leave it empty until we roll out v4 hash completion feature. See Bug 1323856.
+#ifdef NIGHTLY_BUILD
+pref("browser.safebrowsing.provider.google4.gethashURL", "https://safebrowsing.googleapis.com/v4/fullHashes:find?$ct=application/x-protobuf&key=%GOOGLE_API_KEY%");
+#else
 pref("browser.safebrowsing.provider.google4.gethashURL", "");
+#endif // NIGHTLY_BUILD
 pref("browser.safebrowsing.provider.google4.reportURL", "https://safebrowsing.google.com/safebrowsing/diagnostic?client=%NAME%&hl=%LOCALE%&site=");
 pref("browser.safebrowsing.provider.google4.reportPhishMistakeURL", "https://%LOCALE%.phish-error.mozilla.com/?hl=%LOCALE%&url=");
 pref("browser.safebrowsing.provider.google4.reportMalwareMistakeURL", "https://%LOCALE%.malware-error.mozilla.com/?hl=%LOCALE%&url=");