Revert of Move fetching logic out of ApplicationManager, eliminate url mappings.

mojo/fetcher/local_fetcher.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_FETCHER_LOCAL_FETCHER_H_
-#define MOJO_FETCHER_LOCAL_FETCHER_H_
-
-#include <string>
-
-#include "base/files/file_path.h"
-#include "mojo/shell/fetcher.h"
-#include "url/gurl.h"
-
-namespace mojo {
-
-class NetworkService;
-
-namespace fetcher {
-
-// Implements Fetcher for file:// URLs.
-class LocalFetcher : public shell::Fetcher {
- public:
-  LocalFetcher(NetworkService* network_service,
-               const GURL& url,
-               const GURL& url_without_query,
-               const FetchCallback& loader_callback);
-
-  void GetMimeTypeFromFileCallback(const mojo::String& mime_type);
-
- private:
-  const GURL& GetURL() const override;
-  GURL GetRedirectURL() const override;
-  GURL GetRedirectReferer() const override;
-
-  URLResponsePtr AsURLResponse(base::TaskRunner* task_runner,
-                               uint32_t skip) override;
-
-  void AsPath(
-      base::TaskRunner* task_runner,
-      base::Callback<void(const base::FilePath&, bool)> callback) override;
-
-  std::string MimeType() override;
-
-  bool HasMojoMagic() override;
-
-  bool PeekFirstLine(std::string* line) override;
-
-  GURL url_;
-  base::FilePath path_;
-  std::string mime_type_;
-
-  DISALLOW_COPY_AND_ASSIGN(LocalFetcher);
-};
-
-}  // namespace fetcher
-}  // namespace mojo
-
-#endif  // MOJO_FETCHER_LOCAL_FETCHER_H_