Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/browser/web_applications/web_app_win.cc

Index: chrome/browser/web_applications/web_app_win.cc
diff --git a/chrome/browser/web_applications/web_app_win.cc b/chrome/browser/web_applications/web_app_win.cc
index dc7a7ef695fa54391ae046f883bcd8a98293e62c..1cf48002624b3cc6c5c7e390b71f94e65e31f88e 100644
--- a/chrome/browser/web_applications/web_app_win.cc
+++ b/chrome/browser/web_applications/web_app_win.cc
@@ -64,9 +64,9 @@ bool SaveIconWithCheckSum(const base::FilePath& icon_file,
   GetImageCheckSum(image, &digest);
 
   base::FilePath cheksum_file(icon_file.ReplaceExtension(kIconChecksumFileExt));
-  return file_util::WriteFile(cheksum_file,
-                              reinterpret_cast<const char*>(&digest),
-                              sizeof(digest)) == sizeof(digest);
+  return base::WriteFile(cheksum_file,
+                         reinterpret_cast<const char*>(&digest),
+                         sizeof(digest)) == sizeof(digest);
 }
 
 // Returns true if |icon_file| is missing or different from |image|.