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

extensions/common/extensions_client.h

Index: extensions/common/extensions_client.h
diff --git a/extensions/common/extensions_client.h b/extensions/common/extensions_client.h
index b3e98929a3355ec727d473e303a40bf54601c5b1..f0bdc8c4caee61bc4427d08086ae1cca38307b2e 100644
--- a/extensions/common/extensions_client.h
+++ b/extensions/common/extensions_client.h
@@ -19,6 +19,7 @@ namespace extensions {
 class APIPermissionSet;
 class Extension;
 class FeatureProvider;
+class JSONFeatureProviderSource;
 class ManifestPermissionSet;
 class PermissionMessage;
 class PermissionMessageProvider;
@@ -47,6 +48,13 @@ class ExtensionsClient {
   virtual scoped_ptr<FeatureProvider> CreateFeatureProvider(
       const std::string& name) const = 0;
 
+  // Create a JSONFeatureProviderSource for a specific feature type,
+  // e.g. "permission". Currently, all features are loaded from
+  // JSONFeatureProviderSources.
+  // This is used primarily in CreateFeatureProvider, above.
+  virtual scoped_ptr<JSONFeatureProviderSource> CreateFeatureProviderSource(
+      const std::string& name) const = 0;
+
   // Takes the list of all hosts and filters out those with special
   // permission strings. Adds the regular hosts to |new_hosts|,
   // and adds the special permission messages to |messages|.