For downloads requiring a user gesture, also require...

chrome/browser/download/download_state_info.cc

Index: chrome/browser/download/download_state_info.cc
===================================================================
--- chrome/browser/download/download_state_info.cc	(revision 86341)
+++ chrome/browser/download/download_state_info.cc	(working copy)
@@ -12,7 +12,8 @@
       has_user_gesture(false),
       prompt_user_for_save_location(false),
       is_dangerous_file(false),
-      is_dangerous_url(false),
+      is_dangerous_url(UNKNOWN),
+      visited_referrer_before(UNKNOWN),
       is_extension_install(false) {
 }
 
@@ -23,7 +24,8 @@
       has_user_gesture(has_user_gesture),
       prompt_user_for_save_location(prompt_user_for_save_location),
       is_dangerous_file(false),
-      is_dangerous_url(false),
+      is_dangerous_url(UNKNOWN),
+      visited_referrer_before(UNKNOWN),
       is_extension_install(false) {
 }
 
@@ -34,7 +36,8 @@
     bool prompt_user_for_save_location,
     int uniquifier,
     bool dangerous_file,
-    bool dangerous_url,
+    Tristate dangerous_url,
+    Tristate visited_referrer_before,
     bool extension_install)
     : target_name(target),
       path_uniquifier(uniquifier),
@@ -42,10 +45,11 @@
       prompt_user_for_save_location(prompt_user_for_save_location),
       is_dangerous_file(dangerous_file),
       is_dangerous_url(dangerous_url),
+      visited_referrer_before(visited_referrer_before),
       is_extension_install(extension_install),
       force_file_name(forced_name) {
 }
 
 bool DownloadStateInfo::IsDangerous() const {
-  return is_dangerous_url || is_dangerous_file;
+  return (is_dangerous_url == YES) || is_dangerous_file;
 }