Move IsStringUTF8/ASCII to base namespace

ppapi/shared_impl/dictionary_var.cc

 // Copyright (c) 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 "ppapi/shared_impl/dictionary_var.h"
 
 #include "base/memory/ref_counted.h"
 #include "base/strings/string_util.h"
 #include "ppapi/shared_impl/array_var.h"
 #include "ppapi/shared_impl/ppapi_globals.h"
@@ skipping 72 matching lines @@
        iter != key_value_map_.end();
        ++iter) {
     array_var->elements().push_back(ScopedPPVar(
         ScopedPPVar::PassRef(), StringVar::StringToPPVar(iter->first)));
   }
   return array_var->GetPPVar();
 }
 
 bool DictionaryVar::SetWithStringKey(const std::string& utf8_key,
                                      const PP_Var& value) {
-  if (!IsStringUTF8(utf8_key))
+  if (!base::IsStringUTF8(utf8_key))
     return false;
 
   key_value_map_[utf8_key] = value;
   return true;
 }
 
 void DictionaryVar::DeleteWithStringKey(const std::string& utf8_key) {
   key_value_map_.erase(utf8_key);
 }
 
 }  // namespace ppapi