Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/utility/media_galleries/pmp_column_reader_unittest.cc

Index: chrome/utility/media_galleries/pmp_column_reader_unittest.cc
diff --git a/chrome/utility/media_galleries/pmp_column_reader_unittest.cc b/chrome/utility/media_galleries/pmp_column_reader_unittest.cc
index eb6fee1b59b472ba64ba505d9008b2039537b6b3..4f7452ee2b6ef8398ce08d8e27c9b6306e83ef6d 100644
--- a/chrome/utility/media_galleries/pmp_column_reader_unittest.cc
+++ b/chrome/utility/media_galleries/pmp_column_reader_unittest.cc
@@ -30,7 +30,7 @@ bool InitColumnReaderFromBytes(
     return false;
 
   // Explicit conversion from signed to unsigned.
-  size_t bytes_written = file_util::WriteFile(temp_path, &data[0], data.size());
+  size_t bytes_written = base::WriteFile(temp_path, &data[0], data.size());
   if (bytes_written != data.size())
     return false;