Move chrome/common/extensions/background_info.h to src/extensions

extensions/common/file_util.h

+// Copyright 2013 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 EXTENSIONS_COMMON_FILE_UTIL_H_
+#define EXTENSIONS_COMMON_FILE_UTIL_H_
+
+class GURL;
+
+namespace base {
+class FilePath;
+}
+
+namespace extensions {
+namespace file_util {
+
+// Get a relative file path from a chrome-extension:// URL.
+base::FilePath ExtensionURLToRelativeFilePath(const GURL& url);
+
+// Get a full file path from a chrome-extension-resource:// URL, If the URL
+// points a file outside of root, this function will return empty FilePath.
+base::FilePath ExtensionResourceURLToFilePath(const GURL& url,
+                                              const base::FilePath& root);
+
+}  // namespace file_util
+}  // namespace extensions
+
+#endif  // EXTENSIONS_COMMON_FILE_UTIL_H_