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

mojo/shell/network_fetcher.h

Index: mojo/shell/network_fetcher.h
diff --git a/mojo/shell/network_fetcher.h b/mojo/shell/network_fetcher.h
new file mode 100644
index 0000000000000000000000000000000000000000..5b9ab650e7cb8cfcfda8e70919fca9d96ad4def4
--- /dev/null
+++ b/mojo/shell/network_fetcher.h
@@ -0,0 +1,85 @@
+// 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_NETWORK_FETCHER_H_
+#define MOJO_SHELL_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 shell {
+
+// Implements Fetcher for http[s] files.
+class NetworkFetcher : public 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 shell
+}  // namespace mojo
+
+#endif  // MOJO_SHELL_NETWORK_FETCHER_H_