PaymentApp: Implement GetAllManifests() in PaymentAppContext.

content/test/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/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
@@ skipping 1122 matching lines @@
     "../browser/memory/memory_monitor_win_unittest.cc",
     "../browser/memory/test_memory_monitor.cc",
     "../browser/memory/test_memory_monitor.h",
     "../browser/net/quota_policy_cookie_store_unittest.cc",
     "../browser/notification_service_impl_unittest.cc",
     "../browser/notifications/notification_database_data_unittest.cc",
     "../browser/notifications/notification_database_unittest.cc",
     "../browser/notifications/notification_id_generator_unittest.cc",
     "../browser/notifications/platform_notification_context_unittest.cc",
     "../browser/notifications/type_converters_unittest.cc",
+    "../browser/payments/payment_app_content_unittest_base.cc",
+    "../browser/payments/payment_app_content_unittest_base.h",
+    "../browser/payments/payment_app_context_impl_unittest.cc",
     "../browser/payments/payment_app_manager_unittest.cc",
     "../browser/presentation/presentation_service_impl_unittest.cc",
     "../browser/presentation/presentation_type_converters_unittest.cc",
     "../browser/quota/mock_quota_manager.cc",
     "../browser/quota/mock_quota_manager.h",
     "../browser/quota/mock_quota_manager_proxy.cc",
     "../browser/quota/mock_quota_manager_proxy.h",
     "../browser/quota/mock_quota_manager_unittest.cc",
     "../browser/quota/quota_backend_impl_unittest.cc",
     "../browser/quota/quota_database_unittest.cc",
@@ skipping 572 matching lines @@
   if (is_android) {
     deps += [ "//testing/android/native_test:native_test_native_code" ]
   }
 }
 
 group("fuzzers") {
   deps = [
     "//content/test/fuzzer",
   ]
 }