Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/browser/ui/metro_pin_tab_helper_win.cc

Index: chrome/browser/ui/metro_pin_tab_helper_win.cc
diff --git a/chrome/browser/ui/metro_pin_tab_helper_win.cc b/chrome/browser/ui/metro_pin_tab_helper_win.cc
index 10736d94c32352642ed6a8c2ee507dccd0ce9fdd..15a47e2ea16684d9f9b9dcd2ad368c87219a3c9c 100644
--- a/chrome/browser/ui/metro_pin_tab_helper_win.cc
+++ b/chrome/browser/ui/metro_pin_tab_helper_win.cc
@@ -108,9 +108,9 @@ bool CreateSiteSpecificLogo(const SkBitmap& bitmap,
     return false;
 
   *logo_path = logo_dir.Append(tile_id).ReplaceExtension(L".png");
-  return file_util::WriteFile(*logo_path,
-                              reinterpret_cast<char*>(&logo_png[0]),
-                              logo_png.size()) > 0;
+  return base::WriteFile(*logo_path,
+                         reinterpret_cast<char*>(&logo_png[0]),
+                         logo_png.size()) > 0;
 }
 
 // Get the path to the backup logo. If the backup logo already exists in