Trusted plugin: Remove EnumerateManifestKeys.

ppapi/native_client/src/trusted/plugin/service_runtime.cc

Index: ppapi/native_client/src/trusted/plugin/service_runtime.cc
diff --git a/ppapi/native_client/src/trusted/plugin/service_runtime.cc b/ppapi/native_client/src/trusted/plugin/service_runtime.cc
index e9eba183482bfb1e79484ddcf0d4079107602b77..131f9ae98238c71a6b7b7251def743ce9ad00280 100644
--- a/ppapi/native_client/src/trusted/plugin/service_runtime.cc
+++ b/ppapi/native_client/src/trusted/plugin/service_runtime.cc
@@ -184,11 +184,6 @@ void PluginReverseInterface::PostMessage_MainThreadContinuation(
   plugin_->PostMessage(std::string("DEBUG_POSTMESSAGE:") + p->message);
 }
 
-bool PluginReverseInterface::EnumerateManifestKeys(
-    std::set<nacl::string>* out_keys) {
-  return manifest_->GetFileKeys(out_keys);
-}
-
 // TODO(bsy): OpenManifestEntry should use the manifest to ResolveKey
 // and invoke StreamAsFile with a completion callback that invokes
 // GetPOSIXFileDesc.