Revert of Extract some stuff into PackageManager

mojo/shell/test_package_manager.h

-// Copyright 2015 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.
-
-#ifndef MOJO_SHELL_TEST_PACKAGE_MANAGER_H_
-#define MOJO_SHELL_TEST_PACKAGE_MANAGER_H_
-
-#include <map>
-#include <string>
-
-#include "mojo/shell/package_manager.h"
-
-class GURL;
-
-namespace mojo {
-namespace shell {
-
-// An implementation of PackageManager used by tests to support content handler
-// registration for MIME types.
-class TestPackageManager : public PackageManager {
- public:
-  TestPackageManager();
-  virtual ~TestPackageManager();
-
-  void RegisterContentHandler(const std::string& mime_type,
-                              const GURL& content_handler_url);
-
- private:
-  using MimeTypeToURLMap = std::map<std::string, GURL>;
-
-  // Overridden from PackageManager:
-  void SetApplicationManager(ApplicationManager* manager) override;
-  GURL ResolveURL(const GURL& url) override;
-  void FetchRequest(
-      URLRequestPtr request,
-      const Fetcher::FetchCallback& loader_callback) override;
-  bool HandleWithContentHandler(Fetcher* fetcher,
-                                const GURL& unresolved_url,
-                                base::TaskRunner* task_runner,
-                                URLResponsePtr* new_response,
-                                GURL* content_handler_url,
-                                std::string* qualifier) override;
-
-  MimeTypeToURLMap mime_type_to_url_;
-
-  DISALLOW_COPY_AND_ASSIGN(TestPackageManager);
-};
-
-}  // namespace shell
-}  // namespace mojo
-
-#endif  // MOJO_SHELL_TEST_PACKAGE_MANAGER_H_