Move IsStringASCII/UTF8 to base namespace.

net/base/net_util.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/base/net_util.h"
 
 #include <algorithm>
 #include <iterator>
 #include <map>
 
@@ skipping 784 matching lines @@
   // don't attempt to divine a file name out of them.
   if (!url.is_valid() || url.SchemeIs("about") || url.SchemeIs("data"))
     return std::string();
 
   const std::string unescaped_url_filename = UnescapeURLComponent(
       url.ExtractFileName(),
       UnescapeRule::SPACES | UnescapeRule::URL_SPECIAL_CHARS);
 
   // The URL's path should be escaped UTF-8, but may not be.
   std::string decoded_filename = unescaped_url_filename;
-  if (!IsStringUTF8(decoded_filename)) {
+  if (!base::IsStringUTF8(decoded_filename)) {
     // TODO(jshin): this is probably not robust enough. To be sure, we need
     // encoding detection.
     base::string16 utf16_output;
     if (!referrer_charset.empty() &&
         base::CodepageToUTF16(unescaped_url_filename,
                               referrer_charset.c_str(),
                               base::OnStringConversionError::FAIL,
                               &utf16_output)) {
       decoded_filename = base::UTF16ToUTF8(utf16_output);
     } else {
@@ skipping 1408 matching lines @@
   }
   return a1.size() * CHAR_BIT;
 }
 
 unsigned MaskPrefixLength(const IPAddressNumber& mask) {
   IPAddressNumber all_ones(mask.size(), 0xFF);
   return CommonPrefixLength(mask, all_ones);
 }
 
 }  // namespace net