Clean up TestFeaturesNativeHandler to use the ExtensionsClient's JSON feature sources.

chrome/browser/ui/extensions/application_launch.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/ui/extensions/application_launch.h"
 
 #include <string>
 
 #include "apps/launcher.h"
 #include "base/command_line.h"
@@ skipping 452 matching lines @@
   // OnDidGetApplicationInfo, which calls
   // web_app::UpdateShortcutForTabContents when it sees UPDATE_SHORTCUT as
   // pending web app action.
   extensions::TabHelper::FromWebContents(tab)->set_pending_web_app_action(
       extensions::TabHelper::UPDATE_SHORTCUT);
 
   return tab;
 }
 
 bool CanLaunchViaEvent(const extensions::Extension* extension) {
-  extensions::FeatureProvider* feature_provider =
+  const extensions::FeatureProvider* feature_provider =
       extensions::FeatureProvider::GetAPIFeatures();
   extensions::Feature* feature = feature_provider->GetFeature("app.runtime");
   return feature->IsAvailableToExtension(extension).is_available();
 }