Move WriteFile and WriteFileDescriptor from file_util to base namespace.

skia/ext/image_operations_unittest.cc

Index: skia/ext/image_operations_unittest.cc
diff --git a/skia/ext/image_operations_unittest.cc b/skia/ext/image_operations_unittest.cc
index c7069e2817243f8ef9cb1baf7861554024ffa6f9..da55e4f269d3043ef2037f34fe954aadcc66cc68 100644
--- a/skia/ext/image_operations_unittest.cc
+++ b/skia/ext/image_operations_unittest.cc
@@ -204,7 +204,7 @@ void SaveBitmapToPNG(const SkBitmap& bmp, const char* path) {
 
   const base::FilePath fpath(path);
   const int num_written =
-      file_util::WriteFile(fpath, reinterpret_cast<const char*>(&png[0]),
+      base::WriteFile(fpath, reinterpret_cast<const char*>(&png[0]),
                            png.size());
   if (num_written != static_cast<int>(png.size())) {
     FAIL() << "Failed to write dest \"" << path << '"';