Revert 257524 "Move IsStringASCII/UTF8 to base namespace."

trunk/src/net/base/net_util.cc

Index: trunk/src/net/base/net_util.cc
===================================================================
--- trunk/src/net/base/net_util.cc	(revision 257532)
+++ trunk/src/net/base/net_util.cc	(working copy)
@@ -802,7 +802,7 @@
 
   // The URL's path should be escaped UTF-8, but may not be.
   std::string decoded_filename = unescaped_url_filename;
-  if (!base::IsStringUTF8(decoded_filename)) {
+  if (!IsStringUTF8(decoded_filename)) {
     // TODO(jshin): this is probably not robust enough. To be sure, we need
     // encoding detection.
     base::string16 utf16_output;