Fix the Download Notifications for Offline Pages to indicate bytes loaded.

components/offline_pages/core/background/request_queue_unittest.cc

Index: components/offline_pages/core/background/request_queue_unittest.cc
diff --git a/components/offline_pages/core/background/request_queue_unittest.cc b/components/offline_pages/core/background/request_queue_unittest.cc
index 3f5dc45564d1d59a900654811b776e373e17a420..ed9054bc6c0df413866a6c447e33a4ec022f2d5a 100644
--- a/components/offline_pages/core/background/request_queue_unittest.cc
+++ b/components/offline_pages/core/background/request_queue_unittest.cc
@@ -63,6 +63,11 @@ class RequestNotifierStub : public RequestNotifier {
     total_expired_requests_++;
   }
 
+  void NotifyNetworkProgress(const SavePageRequest& request,
+                             int64_t received_bytes) override {
+    // This has nothing to do with the queue (progress is ephemeral) - no test.
+  }
+
   const SavePageRequest& last_expired_request() {
     return last_expired_request_;
   }