Clean up DownloadAttribution Finch experiments

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 d07af76d67d6559c88a3269dea52b3cd2fdde7c5..3742cf1a6bfc0f71246bc23ba4a9e919b8b7bfa7 100644
--- a/chrome/browser/safe_browsing/safe_browsing_navigation_observer_manager.h
+++ b/chrome/browser/safe_browsing/safe_browsing_navigation_observer_manager.h
@@ -13,8 +13,6 @@
 #include "third_party/protobuf/src/google/protobuf/repeated_field.h"
 #include "url/gurl.h"
 
-class Profile;
-
 namespace safe_browsing {
 
 class SafeBrowsingNavigationObserver;
@@ -95,8 +93,6 @@ struct NavigationEventList {
 class SafeBrowsingNavigationObserverManager
     : public base::RefCountedThreadSafe<SafeBrowsingNavigationObserverManager> {
  public:
-  static const base::Feature kDownloadAttribution;
-
   // For UMA histogram counting. Do NOT change order.
   enum AttributionResult {
     SUCCESS = 1,                   // Identified referrer chain is not empty.
@@ -120,9 +116,9 @@ class SafeBrowsingNavigationObserverManager
   static GURL ClearEmptyRef(const GURL& url);
 
   // Checks if we should enable observing navigations for safe browsing purpose.
-  // Return true if the safe browsing service and the |kDownloadAttribution|
-  // feature are both enabled, and safe browsing service is initialized.
-  static bool IsEnabledAndReady(Profile* profile);
+  // Return true if the safe browsing safe browsing service is enabled and
+  // initialized.
+  static bool IsEnabledAndReady(content::WebContents* web_contents);
 
   SafeBrowsingNavigationObserverManager();