Remove stl_util's deletion functions from chromeos/.

chromeos/settings/timezone_settings.h

Index: chromeos/settings/timezone_settings.h
diff --git a/chromeos/settings/timezone_settings.h b/chromeos/settings/timezone_settings.h
index 7ab0084b00837088d2105591192a15695933747e..b504cc66d35ac645ae2482b10cded028dffe13fb 100644
--- a/chromeos/settings/timezone_settings.h
+++ b/chromeos/settings/timezone_settings.h
@@ -42,7 +42,8 @@ class CHROMEOS_EXPORT TimezoneSettings {
   virtual void AddObserver(Observer* observer) = 0;
   virtual void RemoveObserver(Observer* observer) = 0;
 
-  virtual const std::vector<icu::TimeZone*>& GetTimezoneList() const = 0;
+  virtual const std::vector<std::unique_ptr<icu::TimeZone>>& GetTimezoneList()
+      const = 0;
 
   // Gets timezone ID which is also used as timezone pref value.
   static base::string16 GetTimezoneID(const icu::TimeZone& timezone);