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diff --git a/chrome/browser/extensions/unpacked_installer.h b/chrome/browser/extensions/unpacked_installer.h
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+++ b/chrome/browser/extensions/unpacked_installer.h
@@ -0,0 +1,82 @@
+// Copyright (c) 2011 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 CHROME_BROWSER_EXTENSIONS_UNPACKED_INSTALLER_H_
+#define CHROME_BROWSER_EXTENSIONS_UNPACKED_INSTALLER_H_
+#pragma once
+
+#include <string>
+
+#include "base/file_path.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+
+class Extension;
+class ExtensionService;
+
+namespace extensions {
+
+// Installs and loads an unpacked extension.
+// TODO(erikkay): It might be useful to be able to load a packed extension
+// (presumably into memory) without installing it.
+class UnpackedInstaller
+    : public base::RefCountedThreadSafe<UnpackedInstaller> {
+ public:
+  static scoped_refptr<UnpackedInstaller> Create(
+      ExtensionService* extension_service);
+
+  // Loads the extension from the directory |extension_path|, which is
+  // the top directory of a specific extension where its manifest file lives.
+  // Errors are reported through ExtensionErrorReporter. On success,
+  // ExtensionService::AddExtension() is called.
+  void Load(const FilePath& extension_path);
+
+  // Loads the extension from the directory |extension_path|;
+  // for use with command line switch --load-extension=path.
+  // This is equivalent to Load, except that it runs synchronously.
+  void LoadFromCommandLine(const FilePath& extension_path);
+
+  // Allows prompting for plugins to be disabled; intended for testing only.
+  bool prompt_for_plugins() { return prompt_for_plugins_; }
+  void set_prompt_for_plugins(bool val) { prompt_for_plugins_ = val; }
+
+ private:
+  friend class base::RefCountedThreadSafe<UnpackedInstaller>;
+
+  explicit UnpackedInstaller(ExtensionService* extension_service);
+  virtual ~UnpackedInstaller();
+
+  // We change the input extension path to an absolute path, on the file thread.
+  // Then we need to check the file access preference, which needs
+  // to happen back on the UI thread, so it posts CheckExtensionFileAccess on
+  // the UI thread. In turn, once that gets the pref, it goes back to the
+  // file thread with LoadWithFileAccess.
+  // TODO(yoz): It would be nice to remove this ping-pong, but we need to know
+  // what file access flags to pass to extension_file_util::LoadExtension.
+  void GetAbsolutePath();
+  void CheckExtensionFileAccess();
+  void LoadWithFileAccess(bool allow_file_access);
+
+  // Notify the frontend that there was an error loading an extension.
+  void ReportExtensionLoadError(const std::string& error);
+
+  // Called when an unpacked extension has been loaded and installed.
+  void OnLoaded(const scoped_refptr<const Extension>& extension);
+
+  base::WeakPtr<ExtensionService> service_weak_;
+
+  // The pathname of the directory to load from, which is an absolute path
+  // after GetAbsolutePath has been called.
+  FilePath extension_path_;
+
+  // If true and the extension contains plugins, we prompt the user before
+  // loading.
+  bool prompt_for_plugins_;
+
+  DISALLOW_COPY_AND_ASSIGN(UnpackedInstaller);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_UNPACKED_INSTALLER_H_