Unpack extensions inside chrome's directory.

chrome/common/extensions/extension_file_util.h

 // Copyright (c) 2009 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_COMMON_EXTENSIONS_EXTENSION_FILE_UTIL_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_FILE_UTIL_H_
 
 #include <set>
 #include <string>
 
 #include "base/file_path.h"
 #include "chrome/common/extensions/extension.h"
 
 class ExtensionMessageBundle;
 
 // Utilties for manipulating the on-disk storage of extensions.
 namespace extension_file_util {
 
 // The name of the directory inside the profile that we store installed
 // extension in.
 extern const char kInstallDirectoryName[];
 
 // The name of the file that contains the current version of an installed
 // extension.
 extern const char kCurrentVersionFileName[];
 
 // Move source_dir to dest_dir (it will actually be named dest_dir, not inside
-// dest_dir). If the parent path doesn't exixt, create it. If something else is
+// dest_dir). If the parent path doesn't exist, create it. If something else is
 // already there, remove it.
 bool MoveDirSafely(const FilePath& source_dir, const FilePath& dest_dir);
 
 // Updates the Current Version file inside the installed extension.
 bool SetCurrentVersion(const FilePath& dest_dir,
                        const std::string& version,
                        std::string* error);
 
 // Reads the Current Version file.
 bool ReadCurrentVersion(const FilePath& dir, std::string* version_string);
@@ skipping 60 matching lines @@
 // reserved list we return false, and set error message.
 bool CheckForIllegalFilenames(const FilePath& extension_path,
                               std::string* error);
 
 // Get a relative file path from a chrome-extension:// URL.
 FilePath ExtensionURLToRelativeFilePath(const GURL& url);
 
 }  // extension_file_util
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_FILE_UTIL_H_