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

ios/chrome/browser/net/proxy_service_factory.h

Index: ios/chrome/browser/net/proxy_service_factory.h
diff --git a/ios/chrome/browser/net/proxy_service_factory.h b/ios/chrome/browser/net/proxy_service_factory.h
index 7710680c192153906aaef07ed7b23975cb6c0b9f..a7cefa18e9d956a05bb7b5e5f5be77bcaed1c877 100644
--- a/ios/chrome/browser/net/proxy_service_factory.h
+++ b/ios/chrome/browser/net/proxy_service_factory.h
@@ -5,8 +5,9 @@
 #ifndef IOS_CHROME_BROWSER_NET_PROXY_SERVICE_FACTORY_H_
 #define IOS_CHROME_BROWSER_NET_PROXY_SERVICE_FACTORY_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 
 class PrefProxyConfigTracker;
 class PrefService;
@@ -24,25 +25,25 @@ namespace ios {
 class ProxyServiceFactory {
  public:
   // Creates a ProxyConfigService that delivers the system preferences.
-  static scoped_ptr<net::ProxyConfigService> CreateProxyConfigService(
+  static std::unique_ptr<net::ProxyConfigService> CreateProxyConfigService(
       PrefProxyConfigTracker* tracker);
 
   // Creates a PrefProxyConfigTracker that tracks browser state preferences.
-  static scoped_ptr<PrefProxyConfigTracker>
+  static std::unique_ptr<PrefProxyConfigTracker>
   CreatePrefProxyConfigTrackerOfProfile(PrefService* browser_state_prefs,
                                         PrefService* local_state_prefs);
 
   // Creates a PrefProxyConfigTracker that tracks local state only. This tracker
   // should be used for the system request context.
-  static scoped_ptr<PrefProxyConfigTracker>
+  static std::unique_ptr<PrefProxyConfigTracker>
   CreatePrefProxyConfigTrackerOfLocalState(PrefService* local_state_prefs);
 
   // Create a proxy service.
-  static scoped_ptr<net::ProxyService> CreateProxyService(
+  static std::unique_ptr<net::ProxyService> CreateProxyService(
       net::NetLog* net_log,
       net::URLRequestContext* context,
       net::NetworkDelegate* network_delegate,
-      scoped_ptr<net::ProxyConfigService> proxy_config_service,
+      std::unique_ptr<net::ProxyConfigService> proxy_config_service,
       bool quick_check_enabled);
 
  private: