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

ios/web/webui/url_data_manager_ios_backend.mm

Index: ios/web/webui/url_data_manager_ios_backend.mm
diff --git a/ios/web/webui/url_data_manager_ios_backend.mm b/ios/web/webui/url_data_manager_ios_backend.mm
index ce3e2790dd1d1e94438ce262806d6a3bdd9f67b7..5ee98be9fc2e21cd8d8ae878089ea0193d7393ce 100644
--- a/ios/web/webui/url_data_manager_ios_backend.mm
+++ b/ios/web/webui/url_data_manager_ios_backend.mm
@@ -12,6 +12,7 @@
 #include "base/debug/alias.h"
 #include "base/lazy_instance.h"
 #include "base/macros.h"
+#include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/memory/weak_ptr.h"
@@ -397,10 +398,10 @@ URLDataManagerIOSBackend::~URLDataManagerIOSBackend() {
 }
 
 // static
-scoped_ptr<net::URLRequestJobFactory::ProtocolHandler>
+std::unique_ptr<net::URLRequestJobFactory::ProtocolHandler>
 URLDataManagerIOSBackend::CreateProtocolHandler(BrowserState* browser_state) {
   DCHECK(browser_state);
-  return make_scoped_ptr(new ChromeProtocolHandler(
+  return base::WrapUnique(new ChromeProtocolHandler(
       browser_state, browser_state->IsOffTheRecord()));
 }