Get rid of PrefService::GetMutableDictionary/GetMutableList

chrome/browser/ui/cocoa/window_size_autosaver.mm

Index: chrome/browser/ui/cocoa/window_size_autosaver.mm
diff --git a/chrome/browser/ui/cocoa/window_size_autosaver.mm b/chrome/browser/ui/cocoa/window_size_autosaver.mm
index 5ca987836a8b06f2413c450d736d89a0d055e1cb..07f9abf000123427633c66b31f01047c72c89586 100644
--- a/chrome/browser/ui/cocoa/window_size_autosaver.mm
+++ b/chrome/browser/ui/cocoa/window_size_autosaver.mm
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -7,6 +7,7 @@
 #import "chrome/browser/ui/cocoa/window_size_autosaver.h"
 
 #include "chrome/browser/prefs/pref_service.h"
+#include "chrome/browser/prefs/scoped_user_pref_update.h"
 
 // If the window width stored in the prefs is smaller than this, the size is
 // not restored but instead cleared from the profile -- to protect users from
@@ -52,7 +53,8 @@ const int kMinWindowHeight = 17;
 }
 
 - (void)save:(NSNotification*)notification {
-  DictionaryValue* windowPrefs = prefService_->GetMutableDictionary(path_);
+  DictionaryPrefUpdate update(prefService_, path_);
+  DictionaryValue* windowPrefs = update.Get();
   NSRect frame = [window_ frame];
   if ([window_ styleMask] & NSResizableWindowMask) {
     // Save the origin of the window.
@@ -72,7 +74,8 @@ const int kMinWindowHeight = 17;
 
 - (void)restore {
   // Get the positioning information.
-  DictionaryValue* windowPrefs = prefService_->GetMutableDictionary(path_);
+  DictionaryPrefUpdate update(prefService_, path_);
+  DictionaryValue* windowPrefs = update.Get();
   if ([window_ styleMask] & NSResizableWindowMask) {
     int x1, x2, y1, y2;
     if (!windowPrefs->GetInteger("left", &x1) ||