Get rid of PrefService::GetMutableDictionary/GetMutableList

chrome/browser/ui/views/task_manager_view.cc

 // Copyright (c) 2011 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/task_manager/task_manager.h"
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/metrics/stats_table.h"
 #include "base/utf_string_conversions.h"
@@ skipping 604 matching lines @@
     menu_info.fMask = MIIM_STATE;
     if (is_always_on_top_)
       menu_info.fState = MFS_CHECKED;
     r = SetMenuItemInfo(system_menu, IDC_ALWAYS_ON_TOP, FALSE, &menu_info);
 
     // Now change the actual window's behavior.
     window()->SetIsAlwaysOnTop(is_always_on_top_);
 
     // Save the state.
     if (g_browser_process->local_state()) {
-      DictionaryValue* window_preferences =
-          g_browser_process->local_state()->GetMutableDictionary(
-              WideToUTF8(GetWindowName()).c_str());
+      DictionaryPrefsUpdate update(g_browser_process->local_state(),
+                                   WideToUTF8(GetWindowName()).c_str());
+      DictionaryValue* window_preferences = update.GetMutableValue();
       window_preferences->SetBoolean("always_on_top", is_always_on_top_);
     }
     return true;
   }
   return false;
 }
 
 std::wstring TaskManagerView::GetWindowTitle() const {
   return UTF16ToWide(l10n_util::GetStringUTF16(IDS_TASK_MANAGER_TITLE));
 }
@@ skipping 134 matching lines @@
 // Declared in browser_dialogs.h so others don't need to depend on our header.
 void ShowTaskManager() {
   TaskManagerView::Show(false);
 }
 
 void ShowBackgroundPages() {
   TaskManagerView::Show(true);
 }
 
 }  // namespace browser