Specify the use of RiskAdvisoryData for Wallet unmask requests on iOS.

components/autofill/core/browser/card_unmask_delegate.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/autofill/core/browser/card_unmask_delegate.h"
 
 namespace autofill {
 
 CardUnmaskDelegate::UnmaskResponse::UnmaskResponse()
-    : should_store_pan(false) {}
+    : should_store_pan(false),
+      providing_risk_advisory_data(false) {
+#if defined(OS_IOS)
+  // On iOS, we generate a RiskAdvisoryData instead of the
+  // BrowserNativeFingerprinting produced on other platforms. This field
+  // directs the Wallet client to configure the request accordingly.
+  providing_risk_advisory_data = true;
+#endif
+}
+
 CardUnmaskDelegate::UnmaskResponse::~UnmaskResponse() {}
 
 }  // namespace autofill