Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/browser/nacl_host/test/mock_nacl_gdb.cc

Index: chrome/browser/nacl_host/test/mock_nacl_gdb.cc
diff --git a/chrome/browser/nacl_host/test/mock_nacl_gdb.cc b/chrome/browser/nacl_host/test/mock_nacl_gdb.cc
index 097f1f9426a3c3823ce5a6f9e1b046f59882d6ef..36ff08c7e02479393be5f83b842d720ee6283333 100644
--- a/chrome/browser/nacl_host/test/mock_nacl_gdb.cc
+++ b/chrome/browser/nacl_host/test/mock_nacl_gdb.cc
@@ -50,15 +50,15 @@ int main(int argc, char** argv) {
       i += 2;
       CHECK_LE(i, argc);
       std::string nacl_gdb_script(argv[i - 1]);
-      file_util::WriteFile(base::FilePath::FromUTF8Unsafe(nacl_gdb_script),
-                           kPass, strlen(kPass));
+      base::WriteFile(base::FilePath::FromUTF8Unsafe(nacl_gdb_script),
+                      kPass, strlen(kPass));
       continue;
     }
     // Unknown argument.
     NOTREACHED() << "Invalid argument " << argv[i];
   }
   CHECK_EQ(i, argc);
-  file_util::WriteFile(base::FilePath::FromUTF8Unsafe(mock_nacl_gdb_file),
-                       kPass, strlen(kPass));
+  base::WriteFile(base::FilePath::FromUTF8Unsafe(mock_nacl_gdb_file),
+                  kPass, strlen(kPass));
   return 0;
 }