Offline Pages: Replace Observer::OfflinePageModelChanged with OfflinePageAdded.

chrome/browser/ntp_snippets/download_suggestions_provider.cc

 // Copyright 2016 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/ntp_snippets/download_suggestions_provider.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 288 matching lines @@
 
   callback.Run(std::move(suggestions));
 }
 
 void DownloadSuggestionsProvider::OfflinePageModelLoaded(
     offline_pages::OfflinePageModel* model) {
   DCHECK_EQ(offline_page_model_, model);
   AsynchronouslyFetchOfflinePagesDownloads(/*notify=*/true);
 }
 
-void DownloadSuggestionsProvider::OfflinePageModelChanged(
-    offline_pages::OfflinePageModel* model) {
+void DownloadSuggestionsProvider::OfflinePageAdded(
+    offline_pages::OfflinePageModel* model,
+    const offline_pages::OfflinePageItem& added_page) {
+  // TODO(dewittj, vitaliii): Don't refetch everything when this is called.
   DCHECK_EQ(offline_page_model_, model);
   AsynchronouslyFetchOfflinePagesDownloads(/*notify=*/true);
 }
 
 void DownloadSuggestionsProvider::OfflinePageDeleted(
     int64_t offline_id,
     const offline_pages::ClientId& client_id) {
   DCHECK(offline_page_model_);
   if (IsClientIdForOfflinePageDownload(
           offline_page_model_->GetPolicyController(), client_id)) {
@@ skipping 424 matching lines @@
 void DownloadSuggestionsProvider::UnregisterDownloadItemObservers() {
   DCHECK_NE(download_manager_, nullptr);
 
   std::vector<DownloadItem*> all_downloads;
   download_manager_->GetAllDownloads(&all_downloads);
 
   for (DownloadItem* item : all_downloads) {
     item->RemoveObserver(this);
   }
 }