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

ios/chrome/browser/suggestions/suggestions_service_factory.h

Index: ios/chrome/browser/suggestions/suggestions_service_factory.h
diff --git a/ios/chrome/browser/suggestions/suggestions_service_factory.h b/ios/chrome/browser/suggestions/suggestions_service_factory.h
index 0cb8f821237b047c36452211f53d5a966f19d6a9..d9d9c8cacc5c7b1e7f0b238c83510d549d561228 100644
--- a/ios/chrome/browser/suggestions/suggestions_service_factory.h
+++ b/ios/chrome/browser/suggestions/suggestions_service_factory.h
@@ -5,8 +5,9 @@
 #ifndef IOS_CHROME_BROWSER_SUGGESTIONS_SUGGESTIONS_SERVICE_FACTORY_H_
 #define IOS_CHROME_BROWSER_SUGGESTIONS_SUGGESTIONS_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 {
@@ -39,7 +40,7 @@ class SuggestionsServiceFactory : public BrowserStateKeyedServiceFactory {
   ~SuggestionsServiceFactory() override;
 
   // BrowserStateKeyedServiceFactory implementation.
-  scoped_ptr<KeyedService> BuildServiceInstanceFor(
+  std::unique_ptr<KeyedService> BuildServiceInstanceFor(
       web::BrowserState* context) const override;
   void RegisterBrowserStatePrefs(
       user_prefs::PrefRegistrySyncable* registry) override;