Storage manager: Show "0 B" as the total size of other users when there is no other user.

chrome/browser/ui/webui/options/chromeos/storage_manager_handler.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/ui/webui/options/chromeos/storage_manager_handler.h"
 
 #include <algorithm>
 #include <numeric>
 #include <string>
 
@@ skipping 353 matching lines @@
       user_manager::UserManager::Get()->GetUsers();
   for (const auto& user : users) {
     if (user->is_active())
       continue;
     other_users_.push_back(user);
     cryptohome::HomedirMethods::GetInstance()->GetAccountDiskUsage(
         cryptohome::Identification(user->GetAccountId()),
         base::Bind(&StorageManagerHandler::OnGetOtherUserSize,
                    weak_ptr_factory_.GetWeakPtr()));
   }
+  // We should show "0 B" if there is no other user.
+  if (other_users_.empty()) {
+    updating_other_users_size_ = false;
+    web_ui()->CallJavascriptFunctionUnsafe(
+        "options.StorageManager.setOtherUsersSize",
+        base::StringValue(ui::FormatBytes(0)));
+  }
 }
 
 void StorageManagerHandler::OnGetOtherUserSize(bool success, int64_t size) {
   user_sizes_.push_back(success ? size : -1);
   if (user_sizes_.size() == other_users_.size()) {
     base::string16 size_string;
     // If all the requests succeed, shows the total bytes in the UI.
     if (std::count(user_sizes_.begin(), user_sizes_.end(), -1) == 0) {
       size_string = ui::FormatBytes(
           std::accumulate(user_sizes_.begin(), user_sizes_.end(), 0LL));
@@ skipping 46 matching lines @@
   web_ui()->CallJavascriptFunctionUnsafe("options.StorageManager.setArcSize",
                                          base::StringValue(size_string));
 }
 
 void StorageManagerHandler::OnClearDriveCacheDone(bool success) {
   UpdateDriveCacheSize();
 }
 
 }  // namespace options
 }  // namespace chromeos