Generalize the usage of referrer chain

chrome/browser/safe_browsing/download_protection_service.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/safe_browsing/download_protection_service.h"
 
 #include <stddef.h>
 
 #include <memory>
 
@@ skipping 1862 matching lines @@
     const GURL& download_url,
     content::WebContents* web_contents) {
   std::unique_ptr<ReferrerChain> referrer_chain =
       base::MakeUnique<ReferrerChain>();
   int download_tab_id = SessionTabHelper::IdForTab(web_contents);
   UMA_HISTOGRAM_BOOLEAN(
       "SafeBrowsing.ReferrerHasInvalidTabID.DownloadAttribution",
       download_tab_id == -1);
   // We look for the referrer chain that leads to the download url first.
   SafeBrowsingNavigationObserverManager::AttributionResult result =
-      navigation_observer_manager_->IdentifyReferrerChainForDownload(
-          download_url,
-          download_tab_id,
-          kDownloadAttributionUserGestureLimit,
+      navigation_observer_manager_->IdentifyReferrerChainByEventURL(
+          download_url, download_tab_id, kDownloadAttributionUserGestureLimit,
           referrer_chain.get());
 
   // If no navigation event is found, this download is not triggered by regular
   // navigation (e.g. html5 file apis, etc). We look for the referrer chain
   // based on relevant WebContents instead.
   if (result ==
           SafeBrowsingNavigationObserverManager::NAVIGATION_EVENT_NOT_FOUND &&
       web_contents && web_contents->GetLastCommittedURL().is_valid()) {
-    result =
-        navigation_observer_manager_->IdentifyReferrerChainByDownloadWebContent(
-            web_contents, kDownloadAttributionUserGestureLimit,
-            referrer_chain.get());
+    result = navigation_observer_manager_->IdentifyReferrerChainByWebContent(
+        web_contents, kDownloadAttributionUserGestureLimit,
+        referrer_chain.get());
   }
 
   UMA_HISTOGRAM_COUNTS_100(
       "SafeBrowsing.ReferrerURLChainSize.DownloadAttribution",
       referrer_chain->size());
   UMA_HISTOGRAM_ENUMERATION(
       "SafeBrowsing.ReferrerAttributionResult.DownloadAttribution", result,
       SafeBrowsingNavigationObserverManager::ATTRIBUTION_FAILURE_TYPE_MAX);
   return referrer_chain;
 }
 
 void DownloadProtectionService::AddReferrerChainToPPAPIClientDownloadRequest(
     const GURL& initiating_frame_url,
     const GURL& initiating_main_frame_url,
     int tab_id,
     bool has_user_gesture,
     ClientDownloadRequest* out_request) {
   if (!base::FeatureList::IsEnabled(
       SafeBrowsingNavigationObserverManager::kDownloadAttribution) ||
       !navigation_observer_manager_) {
     return;
   }
 
   UMA_HISTOGRAM_BOOLEAN(
       "SafeBrowsing.ReferrerHasInvalidTabID.DownloadAttribution",
       tab_id == -1);
   SafeBrowsingNavigationObserverManager::AttributionResult result =
-      navigation_observer_manager_->IdentifyReferrerChainForDownloadHostingPage(
+      navigation_observer_manager_->IdentifyReferrerChainByHostingPage(
           initiating_frame_url, initiating_main_frame_url, tab_id,
           has_user_gesture, kDownloadAttributionUserGestureLimit,
           out_request->mutable_referrer_chain());
   UMA_HISTOGRAM_COUNTS_100(
       "SafeBrowsing.ReferrerURLChainSize.PPAPIDownloadAttribution",
       out_request->referrer_chain_size());
   UMA_HISTOGRAM_ENUMERATION(
       "SafeBrowsing.ReferrerAttributionResult.PPAPIDownloadAttribution", result,
       SafeBrowsingNavigationObserverManager::ATTRIBUTION_FAILURE_TYPE_MAX);
   out_request->set_download_attribution_finch_enabled(true);
 }
 
 }  // namespace safe_browsing