Since SafeBrowsingNavigationObserverManager cleans up navigation events every two minutes, if downl…

chrome/browser/safe_browsing/safe_browsing_navigation_observer_manager.h

Index: chrome/browser/safe_browsing/safe_browsing_navigation_observer_manager.h
diff --git a/chrome/browser/safe_browsing/safe_browsing_navigation_observer_manager.h b/chrome/browser/safe_browsing/safe_browsing_navigation_observer_manager.h
index b3d0c3055a480d446ce44a76baadd218e8faae1d..1321c434b7b99b86fd636dcc22899fd7980b180a 100644
--- a/chrome/browser/safe_browsing/safe_browsing_navigation_observer_manager.h
+++ b/chrome/browser/safe_browsing/safe_browsing_navigation_observer_manager.h
@@ -6,10 +6,12 @@
 #define CHROME_BROWSER_SAFE_BROWSING_SAFE_BROWSING_NAVIGATION_OBSERVER_MANAGER_H_
 
 #include "base/feature_list.h"
+#include "base/supports_user_data.h"
 #include "chrome/common/safe_browsing/csd.pb.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents_observer.h"
+#include "third_party/protobuf/src/google/protobuf/repeated_field.h"
 #include "url/gurl.h"
 
 class Profile;
@@ -20,6 +22,20 @@ class SafeBrowsingNavigationObserver;
 struct NavigationEvent;
 struct ResolvedIPAddress;
 
+typedef google::protobuf::RepeatedPtrField<safe_browsing::ReferrerChainEntry>
+    ReferrerChain;
+
+// User data stored in DownloadItem for referrer chain information.
+class ReferrerChainData : public base::SupportsUserData::Data {
+ public:
+  explicit ReferrerChainData(std::unique_ptr<ReferrerChain> referrer_chain);
+  ~ReferrerChainData() override;
+  ReferrerChain* GetReferrerChain();
+
+ private:
+  std::unique_ptr<ReferrerChain> referrer_chain_;
+};
+
 // Manager class for SafeBrowsingNavigationObserver, which is in charge of
 // cleaning up stale navigation events, and identifying landing page/landing
 // referrer for a specific download.
@@ -32,7 +48,6 @@ class SafeBrowsingNavigationObserverManager
       public base::RefCountedThreadSafe<SafeBrowsingNavigationObserverManager> {
  public:
   static const base::Feature kDownloadAttribution;
-  typedef std::vector<std::unique_ptr<ReferrerChainEntry>> ReferrerChain;
 
   // For UMA histogram counting. Do NOT change order.
   enum AttributionResult {