[Offline Pages] Remove load state from public OfflinePageModel API.

components/offline_pages/core/downloads/download_ui_adapter.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 "components/offline_pages/core/downloads/download_ui_adapter.h"
 
 #include "base/bind.h"
 #include "base/guid.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 57 matching lines @@
   DCHECK(observer);
   if (!observers_.HasObserver(observer))
     return;
   observers_.RemoveObserver(observer);
   --observers_count_;
   // Once the last observer is gone, clear cached data.
   if (observers_count_ == 0)
     ClearCache();
 }
 
-void DownloadUIAdapter::OfflinePageModelLoaded(OfflinePageModel* model) {
-  // This signal is not used here.
-}
-
 void DownloadUIAdapter::OfflinePageAdded(OfflinePageModel* model,
                                          const OfflinePageItem& added_page) {
   DCHECK(model == model_);
   if (!IsVisibleInUI(added_page.client_id))
     return;
 
   const std::string& guid = added_page.client_id.id;
   DCHECK(items_.find(guid) == items_.end());
 
   items_[guid] = base::MakeUnique<ItemInfo>(added_page);
@@ skipping 100 matching lines @@
   // TODO(dimich): Consider adding UMA to record user actions.
 }
 
 bool DownloadUIAdapter::IsVisibleInUI(const ClientId& client_id) {
   const std::string& name_space = client_id.name_space;
   return model_->GetPolicyController()->IsSupportedByDownload(name_space) &&
          base::IsValidGUID(client_id.id);
 }
 
 }  // namespace offline_pages