Move more string_util functions to base namespace.

chrome/browser/profile_resetter/jtl_foundation.cc

 // Copyright 2013 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 "chrome/browser/profile_resetter/jtl_foundation.h"
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 
@@ skipping 21 matching lines @@
   }
   return cached_hashes_[input];
 }
 
 // static
 bool Hasher::IsHash(const std::string& maybe_hash) {
   if (maybe_hash.size() != kHashSizeInBytes)
     return false;
   for (std::string::const_iterator it = maybe_hash.begin();
        it != maybe_hash.end(); ++it) {
-    if (!IsHexDigit(*it))
+    if (!base::IsHexDigit(*it))
       return false;
   }
   return true;
 }
 
 }  // namespace jtl_foundation