PaymentApp: Add PaymentAppProvider class.

content/public/browser/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/ui.gni")
 
 # See //content/BUILD.gn for how this works.
 group("browser") {
   if (is_component_build) {
     public_deps = [
@@ skipping 154 matching lines @@
     "notification_event_dispatcher.h",
     "notification_observer.h",
     "notification_registrar.cc",
     "notification_registrar.h",
     "notification_service.h",
     "notification_source.h",
     "notification_types.h",
     "overscroll_configuration.h",
     "page_navigator.cc",
     "page_navigator.h",
+    "payment_app_provider.h",
     "pepper_flash_settings_helper.h",
     "pepper_vpn_provider_resource_host_proxy.h",
     "permission_manager.h",
     "permission_type.h",
     "platform_notification_context.h",
     "platform_notification_service.h",
     "plugin_data_remover.h",
     "plugin_service.h",
     "plugin_service_filter.h",
     "presentation_connection_message.cc",
@@ skipping 143 matching lines @@
 
   if (is_android) {
     deps += [ "//ui/android" ]
   }
 
   if (use_aura) {
     sources -= [ "context_factory.h" ]
     deps += [ "//ui/aura" ]
   }
 }