Move PrefRegistrySimple to use unique_ptr<Value>

chrome/browser/ui/ash/chrome_launcher_prefs.cc

Index: chrome/browser/ui/ash/chrome_launcher_prefs.cc
diff --git a/chrome/browser/ui/ash/chrome_launcher_prefs.cc b/chrome/browser/ui/ash/chrome_launcher_prefs.cc
index faf9081dd053edb452925f8d30bae7e3ed5906aa..5d60fb7aa3136b1f18c025e3072d3574fc18c01a 100644
--- a/chrome/browser/ui/ash/chrome_launcher_prefs.cc
+++ b/chrome/browser/ui/ash/chrome_launcher_prefs.cc
@@ -48,12 +48,12 @@ const char* kDefaultPinnedApps[] = {
     extension_misc::kGmailAppId, extension_misc::kGoogleDocAppId,
     extension_misc::kYoutubeAppId, ArcSupportHost::kHostAppId};
 
-base::ListValue* CreateDefaultPinnedAppsList() {
+std::unique_ptr<base::ListValue> CreateDefaultPinnedAppsList() {
   std::unique_ptr<base::ListValue> apps(new base::ListValue);
   for (size_t i = 0; i < arraysize(kDefaultPinnedApps); ++i)
     apps->Append(CreateAppDict(kDefaultPinnedApps[i]));
 
-  return apps.release();
+  return apps;
 }
 
 // Returns the preference value for the display with the given |display_id|.