Stop passing raw pointers to base::Value API in c/b/ui

chrome/browser/ui/webui/chromeos/login/network_screen_handler.h

Index: chrome/browser/ui/webui/chromeos/login/network_screen_handler.h
diff --git a/chrome/browser/ui/webui/chromeos/login/network_screen_handler.h b/chrome/browser/ui/webui/chromeos/login/network_screen_handler.h
index a181032850e4659535b6b7ce1e7952c38f43b333..cbf4f71202ddd46acbe806894c142a3b9f9d5700 100644
--- a/chrome/browser/ui/webui/chromeos/login/network_screen_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/network_screen_handler.h
@@ -17,6 +17,10 @@
 #include "ui/base/ime/chromeos/input_method_manager.h"
 #include "ui/gfx/geometry/point.h"
 
+namespace base {
+class ListValue;
+}
+
 namespace chromeos {
 
 class CoreOobeView;
@@ -48,7 +52,7 @@ class NetworkScreenHandler : public NetworkView, public BaseScreenHandler {
   void Initialize() override;
 
   // Returns available timezones. Caller gets the ownership.
-  static base::ListValue* GetTimezoneList();
+  static std::unique_ptr<base::ListValue> GetTimezoneList();
 
   CoreOobeView* core_oobe_view_ = nullptr;
   NetworkScreen* screen_ = nullptr;