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

mojo/shell/update_fetcher.h

Index: mojo/shell/update_fetcher.h
diff --git a/mojo/shell/update_fetcher.h b/mojo/shell/update_fetcher.h
new file mode 100644
index 0000000000000000000000000000000000000000..26c82df40cf42c4baff02b9187ccc118a7c631e2
--- /dev/null
+++ b/mojo/shell/update_fetcher.h
@@ -0,0 +1,55 @@
+// 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_UPDATE_FETCHER_H_
+#define MOJO_SHELL_UPDATE_FETCHER_H_
+
+#include "mojo/shell/fetcher.h"
+
+#include "base/files/file_path.h"
+#include "base/memory/weak_ptr.h"
+#include "mojo/services/updater/updater.mojom.h"
+#include "url/gurl.h"
+
+namespace mojo {
+
+class URLLoaderFactory;
+
+namespace shell {
+
+class UpdateFetcher : public Fetcher {
+ public:
+  UpdateFetcher(const GURL& url,
+                updater::Updater* updater,
+                const FetchCallback& loader_callback);
+
+  ~UpdateFetcher() override;
+
+ private:
+  // Fetcher implementation:
+  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;
+
+  void OnGetAppPath(const mojo::String& path);
+
+  const GURL url_;
+  base::FilePath path_;
+  base::WeakPtrFactory<UpdateFetcher> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(UpdateFetcher);
+};
+
+}  // namespace shell
+}  // namespace mojo
+
+#endif  // MOJO_SHELL_UPDATE_FETCHER_H_