Fix a bug in file_util::Delete() where symlinks are not handled right

base/file_util.h

 // Copyright (c) 2012 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.
 
 // This file contains utility functions for dealing with the local
 // filesystem.
 
 #ifndef BASE_FILE_UTIL_H_
 #define BASE_FILE_UTIL_H_
 #pragma once
@@ skipping 82 matching lines @@
 // particularly speedy in any platform.
 BASE_EXPORT int64 ComputeFilesSize(const FilePath& directory,
                                    const FilePath::StringType& pattern);
 
 // Deletes the given path, whether it's a file or a directory.
 // If it's a directory, it's perfectly happy to delete all of the
 // directory's contents.  Passing true to recursive deletes
 // subdirectories and their contents as well.
 // Returns true if successful, false otherwise.
 //
+// In posix environment and if |path| is a symbolic link, this deletes only
+// the symlink. (even if the symlink deferences to a non-existent file)
+//
 // WARNING: USING THIS WITH recursive==true IS EQUIVALENT
 //          TO "rm -rf", SO USE WITH CAUTION.
 BASE_EXPORT bool Delete(const FilePath& path, bool recursive);
 
 #if defined(OS_WIN)
 // Schedules to delete the given path, whether it's a file or a directory, until
 // the operating system is restarted.
 // Note:
 // 1) The file/directory to be deleted should exist in a temp folder.
 // 2) The directory to be deleted must be empty.
@@ skipping 520 matching lines @@
 };
 
 // Attempts determine the FileSystemType for |path|.
 // Returns false if |path| doesn't exist.
 BASE_EXPORT bool GetFileSystemType(const FilePath& path, FileSystemType* type);
 #endif
 
 }  // namespace file_util
 
 #endif  // BASE_FILE_UTIL_H_