Actually delete databases in CookiesTreeModel.

base/file_util.h

Index: base/file_util.h
diff --git a/base/file_util.h b/base/file_util.h
index cdedfc401548f7997fbbdc1d978e825c8f67fa03..a145acc64502b434917d519415cd2b68ab0095d3 100644
--- a/base/file_util.h
+++ b/base/file_util.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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.
 
@@ -332,6 +332,9 @@ bool GetFileInfo(const FilePath& file_path, FileInfo* info);
 // Deprecated temporary compatibility function.
 bool GetFileInfo(const std::wstring& file_path, FileInfo* info);
 
+// Set the time of the last modification. Useful for unit tests.
+bool SetLastModifiedTime(const FilePath& file_path, base::Time last_modified);
+
 #if defined(OS_POSIX)
 // Store inode number of |path| in |inode|. Return true on success.
 bool GetInode(const FilePath& path, ino_t* inode);