Convert //ios from scoped_ptr to std::unique_ptr.

ios/chrome/browser/search_engines/template_url_service_factory.h

Index: ios/chrome/browser/search_engines/template_url_service_factory.h
diff --git a/ios/chrome/browser/search_engines/template_url_service_factory.h b/ios/chrome/browser/search_engines/template_url_service_factory.h
index 36fbf6f552ef46587f9cc35df3d96298f01c58ad..ac819c89b37814648e088a863d7e2c2d36706b20 100644
--- a/ios/chrome/browser/search_engines/template_url_service_factory.h
+++ b/ios/chrome/browser/search_engines/template_url_service_factory.h
@@ -5,8 +5,9 @@
 #ifndef IOS_CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_SERVICE_FACTORY_H_
 #define IOS_CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_SERVICE_FACTORY_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "components/keyed_service/ios/browser_state_keyed_service_factory.h"
 
 namespace base {
@@ -42,7 +43,7 @@ class TemplateURLServiceFactory : public BrowserStateKeyedServiceFactory {
   // BrowserStateKeyedServiceFactory implementation.
   void RegisterBrowserStatePrefs(
       user_prefs::PrefRegistrySyncable* registry) override;
-  scoped_ptr<KeyedService> BuildServiceInstanceFor(
+  std::unique_ptr<KeyedService> BuildServiceInstanceFor(
       web::BrowserState* context) const override;
   web::BrowserState* GetBrowserStateToUse(
       web::BrowserState* context) const override;