Remove PrefServiceSimple, replacing it with PrefService and PrefRegistrySimple.

chrome/browser/task_manager/task_manager.cc

Index: chrome/browser/task_manager/task_manager.cc
diff --git a/chrome/browser/task_manager/task_manager.cc b/chrome/browser/task_manager/task_manager.cc
index 0fb3dc737135be27a2a66ad0a1569d41b39945e1..8422223263e1ad3061e50bfb74445ade9961621a 100644
--- a/chrome/browser/task_manager/task_manager.cc
+++ b/chrome/browser/task_manager/task_manager.cc
@@ -21,6 +21,7 @@
 #include "chrome/browser/extensions/extension_host.h"
 #include "chrome/browser/extensions/extension_process_manager.h"
 #include "chrome/browser/extensions/extension_system.h"
+#include "chrome/browser/prefs/pref_registry_simple.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/task_manager/task_manager_resource_providers.h"
@@ -1372,7 +1373,7 @@ content::WebContents* TaskManager::Resource::GetWebContents() const {
 bool TaskManager::Resource::IsBackground() const { return false; }
 
 // static
-void TaskManager::RegisterPrefs(PrefServiceSimple* prefs) {
+void TaskManager::RegisterPrefs(PrefRegistrySimple* prefs) {
   prefs->RegisterDictionaryPref(prefs::kTaskManagerWindowPlacement);
 }