Get rid of PrefService::GetMutableDictionary/GetMutableList

chrome/browser/ui/views/task_manager_view.cc

Index: chrome/browser/ui/views/task_manager_view.cc
diff --git a/chrome/browser/ui/views/task_manager_view.cc b/chrome/browser/ui/views/task_manager_view.cc
index d74cc2d094334ddf87ed058c3d7f15b1aa5937d8..c5e135b9e95d6bd0a34be8f64ca759804ebc6910 100644
--- a/chrome/browser/ui/views/task_manager_view.cc
+++ b/chrome/browser/ui/views/task_manager_view.cc
@@ -622,9 +622,9 @@ bool TaskManagerView::ExecuteWindowsCommand(int command_id) {
 
     // 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;