[OfflinePages] RequestCoordinatorFactory return null for incognito

chrome/browser/android/offline_pages/downloads/offline_page_download_bridge.cc

Index: chrome/browser/android/offline_pages/downloads/offline_page_download_bridge.cc
diff --git a/chrome/browser/android/offline_pages/downloads/offline_page_download_bridge.cc b/chrome/browser/android/offline_pages/downloads/offline_page_download_bridge.cc
index fb83bed865ddeea21b479922fff96f8c0a8fa194..28826ae30f5a68bd4a0c9e7a7b3a4c106653cb60 100644
--- a/chrome/browser/android/offline_pages/downloads/offline_page_download_bridge.cc
+++ b/chrome/browser/android/offline_pages/downloads/offline_page_download_bridge.cc
@@ -84,9 +84,13 @@ void SavePageIfNotNavigatedAway(const GURL& original_url,
     offline_pages::RequestCoordinator* request_coordinator =
         offline_pages::RequestCoordinatorFactory::GetForBrowserContext(
             web_contents->GetBrowserContext());
-    request_id = request_coordinator->SavePageLater(
-        url, client_id, true,
-        RequestCoordinator::RequestAvailability::DISABLED_FOR_OFFLINER);
+    if (request_coordinator) {
+      request_id = request_coordinator->SavePageLater(
+          url, client_id, true,
+          RequestCoordinator::RequestAvailability::DISABLED_FOR_OFFLINER);
+    } else {
+      DVLOG(1) << "SavePageIfNotNavigatedAway has no valid coordinator.";
+    }
   }
 
   // Pass request_id to the current tab's helper to attempt download right from
@@ -100,7 +104,10 @@ void SavePageIfNotNavigatedAway(const GURL& original_url,
       offline_pages::RequestCoordinator* request_coordinator =
           offline_pages::RequestCoordinatorFactory::GetForBrowserContext(
               web_contents->GetBrowserContext());
-      request_coordinator->EnableForOffliner(request_id, client_id);
+      if (request_coordinator)
+        request_coordinator->EnableForOffliner(request_id, client_id);
+      else
+        DVLOG(1) << "SavePageIfNotNavigatedAway has no valid coordinator.";
     }
     return;
   }