Move file_util::Delete to the base namespace

base/files/file_util_proxy.cc

Index: base/files/file_util_proxy.cc
diff --git a/base/files/file_util_proxy.cc b/base/files/file_util_proxy.cc
index a1c568a90d31c7d708110ae1fcb6b0ac728d1d98..9f65da8ec98d40b05631de605302334056a9163a 100644
--- a/base/files/file_util_proxy.cc
+++ b/base/files/file_util_proxy.cc
@@ -213,7 +213,7 @@ PlatformFileError DeleteAdapter(const FilePath& file_path, bool recursive) {
   if (!file_util::PathExists(file_path)) {
     return PLATFORM_FILE_ERROR_NOT_FOUND;
   }
-  if (!file_util::Delete(file_path, recursive)) {
+  if (!base::Delete(file_path, recursive)) {
     if (!recursive && !file_util::IsDirectoryEmpty(file_path)) {
       return PLATFORM_FILE_ERROR_NOT_EMPTY;
     }