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

extensions/renderer/api_definitions_natives.cc

 // 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.
 
 #include "extensions/renderer/api_definitions_natives.h"
 
 #include "extensions/common/features/feature.h"
 #include "extensions/common/features/feature_provider.h"
 #include "extensions/renderer/dispatcher.h"
 #include "extensions/renderer/script_context.h"
 
 namespace extensions {
 
 ApiDefinitionsNatives::ApiDefinitionsNatives(Dispatcher* dispatcher,
                                              ScriptContext* context)
     : ObjectBackedNativeHandler(context), dispatcher_(dispatcher) {
   RouteFunction(
       "GetExtensionAPIDefinitionsForTest",
       base::Bind(&ApiDefinitionsNatives::GetExtensionAPIDefinitionsForTest,
                  base::Unretained(this)));
 }
 
 void ApiDefinitionsNatives::GetExtensionAPIDefinitionsForTest(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   std::vector<std::string> apis;
-  FeatureProvider* feature_provider = FeatureProvider::GetAPIFeatures();
+  const FeatureProvider* feature_provider = FeatureProvider::GetAPIFeatures();
   const std::vector<std::string>& feature_names =
       feature_provider->GetAllFeatureNames();
   for (std::vector<std::string>::const_iterator i = feature_names.begin();
        i != feature_names.end();
        ++i) {
     if (!feature_provider->GetParent(feature_provider->GetFeature(*i)) &&
         context()->GetAvailability(*i).is_available()) {
       apis.push_back(*i);
     }
   }
   args.GetReturnValue().Set(
       dispatcher_->v8_schema_registry()->GetSchemas(apis));
 }
 
 }  // namespace extensions