[Offline Pages] Remove obsolete synchronous API methods.

components/offline_pages/offline_page_model.cc

 // Copyright 2015 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/offline_page_model.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 262 matching lines @@
 void OfflinePageModel::HasPages(const std::string& name_space,
                                 const HasPagesCallback& callback) {
   RunWhenLoaded(base::Bind(&OfflinePageModel::HasPagesAfterLoadDone,
                            weak_ptr_factory_.GetWeakPtr(), name_space,
                            callback));
 }
 
 void OfflinePageModel::HasPagesAfterLoadDone(
     const std::string& name_space,
     const HasPagesCallback& callback) const {
-  callback.Run(MaybeHasPages(name_space));
-}
+  DCHECK(is_loaded_);
 
-bool OfflinePageModel::MaybeHasPages(const std::string& name_space) const {
-  if (!is_loaded_)
-    return false;
+  bool has_pages = false;
 
   for (const auto& id_page_pair : offline_pages_) {
-    if (id_page_pair.second.client_id.name_space == name_space)
-      return true;
+    if (id_page_pair.second.client_id.name_space == name_space) {
+      has_pages = true;
+      break;
+    }
   }
 
-  return false;
+  callback.Run(has_pages);
 }
 
 void OfflinePageModel::GetAllPages(const GetAllPagesCallback& callback) {
   if (!is_loaded_) {
     delayed_tasks_.push_back(
         base::Bind(&OfflinePageModel::GetAllPagesAfterLoadDone,
                    weak_ptr_factory_.GetWeakPtr(), callback));
     return;
   }
 
@@ skipping 392 matching lines @@
 void OfflinePageModel::RunWhenLoaded(const base::Closure& task) {
   if (!is_loaded_) {
     delayed_tasks_.push_back(task);
     return;
   }
 
   task_runner_->PostTask(FROM_HERE, task);
 }
 
 }  // namespace offline_pages