Add support for client-side phishing detection for non-UMA users.

chrome/renderer/safe_browsing/features.h

Index: chrome/renderer/safe_browsing/features.h
diff --git a/chrome/renderer/safe_browsing/features.h b/chrome/renderer/safe_browsing/features.h
index 82370c154fb548829aeed2929420c128b4690888..642231ecf5a2a26dc6bbcbcd82a8d0a4f7672caa 100644
--- a/chrome/renderer/safe_browsing/features.h
+++ b/chrome/renderer/safe_browsing/features.h
@@ -71,6 +71,10 @@ class FeatureMap {
 
 namespace features {
 // Constants for the various feature names that we use.
+//
+// IMPORTANT: when adding new features, you must update kAllowedFeatures in
+// chrome/browser/safe_browsing/client_side_detection_service.cc if the feature
+// should be sent in sanitized pingbacks.
 
 ////////////////////////////////////////////////////
 // URL host features