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

ios/chrome/browser/favicon/favicon_service_factory.cc

Index: ios/chrome/browser/favicon/favicon_service_factory.cc
diff --git a/ios/chrome/browser/favicon/favicon_service_factory.cc b/ios/chrome/browser/favicon/favicon_service_factory.cc
index 824baca4ddacb593b2ba7041644ca3da255ceca5..8a9381b0f8e4983d43c9d47990dd0a8c7397eb74 100644
--- a/ios/chrome/browser/favicon/favicon_service_factory.cc
+++ b/ios/chrome/browser/favicon/favicon_service_factory.cc
@@ -4,6 +4,7 @@
 
 #include "ios/chrome/browser/favicon/favicon_service_factory.h"
 
+#include "base/memory/ptr_util.h"
 #include "base/memory/singleton.h"
 #include "components/favicon/core/favicon_service.h"
 #include "components/keyed_service/core/service_access_type.h"
@@ -47,12 +48,12 @@ FaviconServiceFactory::FaviconServiceFactory()
 FaviconServiceFactory::~FaviconServiceFactory() {
 }
 
-scoped_ptr<KeyedService> FaviconServiceFactory::BuildServiceInstanceFor(
+std::unique_ptr<KeyedService> FaviconServiceFactory::BuildServiceInstanceFor(
     web::BrowserState* context) const {
   ios::ChromeBrowserState* browser_state =
       ios::ChromeBrowserState::FromBrowserState(context);
-  return make_scoped_ptr(new favicon::FaviconService(
-      make_scoped_ptr(new FaviconClientImpl(browser_state)),
+  return base::WrapUnique(new favicon::FaviconService(
+      base::WrapUnique(new FaviconClientImpl(browser_state)),
       ios::HistoryServiceFactory::GetForBrowserState(
           browser_state, ServiceAccessType::EXPLICIT_ACCESS)));
 }