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

ios/public/provider/chrome/browser/chrome_browser_provider.h

Index: ios/public/provider/chrome/browser/chrome_browser_provider.h
diff --git a/ios/public/provider/chrome/browser/chrome_browser_provider.h b/ios/public/provider/chrome/browser/chrome_browser_provider.h
index 69daac13b38ae0dd5c307fa61e7d639c64713dfe..6ad7a03c612c918a23966e3dd342920528328766 100644
--- a/ios/public/provider/chrome/browser/chrome_browser_provider.h
+++ b/ios/public/provider/chrome/browser/chrome_browser_provider.h
@@ -7,12 +7,13 @@
 
 #include <CoreGraphics/CoreGraphics.h>
 #include <stddef.h>
+
+#include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
 #include "components/favicon_base/favicon_callback.h"
 
 class AutocompleteProvider;
@@ -118,7 +119,7 @@ class ChromeBrowserProvider {
   virtual void OnMetricsServicesManagerClientDestroyed();
 
   // Returns the SyncedWindowDelegatesGetter implementation.
-  virtual scoped_ptr<browser_sync::SyncedWindowDelegatesGetter>
+  virtual std::unique_ptr<browser_sync::SyncedWindowDelegatesGetter>
   CreateSyncedWindowDelegatesGetter(ios::ChromeBrowserState* browser_state);
 
   // Gets the URLRequestContextGetter used by the SafeBrowsing service. Returns