Move WriteFile and WriteFileDescriptor from file_util to base namespace.

net/tools/crl_set_dump/crl_set_dump.cc

Index: net/tools/crl_set_dump/crl_set_dump.cc
diff --git a/net/tools/crl_set_dump/crl_set_dump.cc b/net/tools/crl_set_dump/crl_set_dump.cc
index 6c3bb54bab5ad7171594c808216e3f5bced1932e..ce6f5e5570d1f719e12f495e1369ae573e2233d0 100644
--- a/net/tools/crl_set_dump/crl_set_dump.cc
+++ b/net/tools/crl_set_dump/crl_set_dump.cc
@@ -62,8 +62,7 @@ int main(int argc, char** argv) {
 
   if (!output_filename.empty()) {
     const std::string out = final_crl_set->Serialize();
-    if (file_util::WriteFile(output_filename, out.data(),
-                               out.size()) == -1) {
+    if (base::WriteFile(output_filename, out.data(), out.size()) == -1) {
       fprintf(stderr, "Failed to write resulting CRL set\n");
       return 1;
     }