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

mojo/fetcher/network_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_NETWORK_FETCHER_H_
-#define MOJO_FETCHER_NETWORK_FETCHER_H_
-
-#include "mojo/shell/fetcher.h"
-
-#include "base/files/file_path.h"
-#include "base/memory/weak_ptr.h"
-#include "mojo/services/network/public/interfaces/url_loader.mojom.h"
-#include "url/gurl.h"
-
-namespace mojo {
-
-class URLLoaderFactory;
-
-namespace fetcher {
-
-// Implements Fetcher for http[s] files.
-class NetworkFetcher : public shell::Fetcher {
- public:
-  NetworkFetcher(bool disable_cache,
-                 mojo::URLRequestPtr request,
-                 URLLoaderFactory* url_loader_factory,
-                 const FetchCallback& loader_callback);
-
-  ~NetworkFetcher() override;
-
- private:
-  // TODO(hansmuller): Revisit this when a real peek operation is available.
-  static const MojoDeadline kPeekTimeout = MOJO_DEADLINE_INDEFINITE;
-
-  const GURL& GetURL() const override;
-  GURL GetRedirectURL() const override;
-  GURL GetRedirectReferer() const override;
-
-  URLResponsePtr AsURLResponse(base::TaskRunner* task_runner,
-                               uint32_t skip) override;
-
-  static void RecordCacheToURLMapping(const base::FilePath& path,
-                                      const GURL& url);
-
-  // AppIds should be be both predictable and unique, but any hash would work.
-  // Currently we use sha256 from crypto/secure_hash.h
-  static bool ComputeAppId(const base::FilePath& path,
-                           std::string* digest_string);
-
-  static bool RenameToAppId(const GURL& url,
-                            const base::FilePath& old_path,
-                            base::FilePath* new_path);
-
-  void CopyCompleted(base::Callback<void(const base::FilePath&, bool)> callback,
-                     bool success);
-
-  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;
-
-  void StartNetworkRequest(mojo::URLRequestPtr request,
-                           URLLoaderFactory* url_loader_factory);
-
-  void OnLoadComplete(URLResponsePtr response);
-
-  bool disable_cache_;
-  const GURL url_;
-  URLLoaderPtr url_loader_;
-  URLResponsePtr response_;
-  base::FilePath path_;
-  base::WeakPtrFactory<NetworkFetcher> weak_ptr_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(NetworkFetcher);
-};
-
-}  // namespace fetcher
-}  // namespace mojo
-
-#endif  // MOJO_FETCHER_NETWORK_FETCHER_H_