Move PathIsWritable, DirectoryExists, ContentsEqual, and TextContentsEqual to the base namespace.

net/test/python_utils.cc

Index: net/test/python_utils.cc
diff --git a/net/test/python_utils.cc b/net/test/python_utils.cc
index 209b50a9eda1ebd0a8a5c8d169e379b83954b7b1..30c5f679a8adeed79b2d28d2232f4ad9478ff613 100644
--- a/net/test/python_utils.cc
+++ b/net/test/python_utils.cc
@@ -48,7 +48,7 @@ bool TryRelativeToDir(const base::FilePath& start_dir,
                       const base::FilePath& to_try,
                       base::FilePath* out_dir) {
   base::FilePath dir(start_dir);
-  while (!file_util::DirectoryExists(dir.Append(to_try))) {
+  while (!base::DirectoryExists(dir.Append(to_try))) {
     base::FilePath parent = dir.DirName();
     if (parent == dir) {
       // We hit the root directory.