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

ios/chrome/browser/signin/gaia_cookie_manager_service_factory.cc

Index: ios/chrome/browser/signin/gaia_cookie_manager_service_factory.cc
diff --git a/ios/chrome/browser/signin/gaia_cookie_manager_service_factory.cc b/ios/chrome/browser/signin/gaia_cookie_manager_service_factory.cc
index bb20c11bb633afa7ef2ebfafbcfe9215d74d3487..7ee2d7035f92a3c220a31f355ceb95b7fc84a5fa 100644
--- a/ios/chrome/browser/signin/gaia_cookie_manager_service_factory.cc
+++ b/ios/chrome/browser/signin/gaia_cookie_manager_service_factory.cc
@@ -4,6 +4,7 @@
 
 #include "ios/chrome/browser/signin/gaia_cookie_manager_service_factory.h"
 
+#include "base/memory/ptr_util.h"
 #include "base/memory/singleton.h"
 #include "components/keyed_service/core/service_access_type.h"
 #include "components/keyed_service/ios/browser_state_dependency_manager.h"
@@ -39,12 +40,12 @@ GaiaCookieManagerServiceFactory::GetInstance() {
   return base::Singleton<GaiaCookieManagerServiceFactory>::get();
 }
 
-scoped_ptr<KeyedService>
+std::unique_ptr<KeyedService>
 GaiaCookieManagerServiceFactory::BuildServiceInstanceFor(
     web::BrowserState* context) const {
   ios::ChromeBrowserState* chrome_browser_state =
       ios::ChromeBrowserState::FromBrowserState(context);
-  return make_scoped_ptr(new GaiaCookieManagerService(
+  return base::WrapUnique(new GaiaCookieManagerService(
       OAuth2TokenServiceFactory::GetForBrowserState(chrome_browser_state),
       GaiaConstants::kChromeSource,
       SigninClientFactory::GetForBrowserState(chrome_browser_state)));