Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/browser/extensions/convert_web_app.cc

Index: chrome/browser/extensions/convert_web_app.cc
diff --git a/chrome/browser/extensions/convert_web_app.cc b/chrome/browser/extensions/convert_web_app.cc
index cb4a490ae22ae9ece4c01d33d0a61fd8d46994be..90d0446aa9a451a4c0a52e25c50d509b0e0d7bd2 100644
--- a/chrome/browser/extensions/convert_web_app.cc
+++ b/chrome/browser/extensions/convert_web_app.cc
@@ -149,7 +149,7 @@ scoped_refptr<Extension> ConvertWebAppToExtension(
 
     const char* image_data_ptr = reinterpret_cast<const char*>(&image_data[0]);
     int size = base::checked_cast<int>(image_data.size());
-    if (file_util::WriteFile(icon_file, image_data_ptr, size) != size) {
+    if (base::WriteFile(icon_file, image_data_ptr, size) != size) {
       LOG(ERROR) << "Could not write icon file.";
       return NULL;
     }