Refactor FileIO to the new design

ppapi/tests/test_url_loader.cc

Index: ppapi/tests/test_url_loader.cc
diff --git a/ppapi/tests/test_url_loader.cc b/ppapi/tests/test_url_loader.cc
index 90244912681fc7c77d24b1746db811fa62ff8205..5bbd1d437d0355c6a681cf07d3e477749e77ab3b 100644
--- a/ppapi/tests/test_url_loader.cc
+++ b/ppapi/tests/test_url_loader.cc
@@ -456,15 +456,6 @@ std::string TestURLLoader::TestStreamToFile() {
   if (data != expected_body)
     return "ReadEntireFile returned unexpected content";
 
-  // FileIOTrusted is not supported by NaCl or ppapi/proxy.
-  if (!testing_interface_->IsOutOfProcess()) {
-#if !(defined __native_client__)
-    int32_t file_descriptor = file_io_trusted_interface_->GetOSFileDescriptor(
-        reader.pp_resource());
-    if (file_descriptor < 0)
-      return "FileIO::GetOSFileDescriptor() returned a bad file descriptor.";
-#endif
-  }
   PASS();
 }