[Payments] Put Web Payments feature on desktop behind flag

chrome/browser/chrome_content_browser_client.cc

 // Copyright (c) 2012 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 "chrome/browser/chrome_content_browser_client.h"
 
 #include <map>
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 3152 matching lines @@
       content::WebContents::FromRenderFrameHost(render_frame_host);
   if (web_contents) {
     registry->AddInterface(
         web_contents->GetJavaInterfaces()
             ->CreateInterfaceFactory<payments::mojom::PaymentRequest>());
     registry->AddInterface(
         base::Bind(&ForwardShareServiceRequest,
                    web_contents->GetJavaInterfaces()->GetWeakPtr()));
   }
 #else
-  if (AreExperimentalWebPlatformFeaturesEnabled()) {
+  if (AreExperimentalWebPlatformFeaturesEnabled() &&
+      base::FeatureList::IsEnabled(features::kWebPayments)) {
     content::WebContents* web_contents =
         content::WebContents::FromRenderFrameHost(render_frame_host);
     if (web_contents) {
       registry->AddInterface(base::Bind(
           payments::CreatePaymentRequestForWebContents, web_contents));
     }
   }
 #endif
 
 #if defined(OS_LINUX) || defined(OS_WIN)
@@ skipping 360 matching lines @@
     RedirectNonUINonIOBrowserThreadsToTaskScheduler() {
   return variations::GetVariationParamValue(
              "BrowserScheduler", "RedirectNonUINonIOBrowserThreads") == "true";
 }
 
 // static
 void ChromeContentBrowserClient::SetDefaultQuotaSettingsForTesting(
     const storage::QuotaSettings* settings) {
   g_default_quota_settings = settings;
 }