Part 2 of repairing regressions to my old clang check plugins so Nico can

chrome/browser/extensions/external_pref_extension_loader.cc

 // Copyright (c) 2011 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/extensions/external_pref_extension_loader.h"
 
 #include "app/app_paths.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/logging.h"
@@ skipping 94 matching lines @@
   FilePath fake_json_path = fake_base_path.AppendASCII("fake.json");
   testing_prefs_.reset(ExtractPrefs(fake_json_path, &serializer));
 }
 
 void ExternalTestingExtensionLoader::StartLoading() {
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   prefs_.reset(testing_prefs_->DeepCopy());
   LoadFinished();
 }
 
+ExternalTestingExtensionLoader::~ExternalTestingExtensionLoader() {}
+
 const FilePath ExternalTestingExtensionLoader::GetBaseCrxFilePath() {
   return fake_base_path_;
 }