Remove wchar_t versions of StringPrintf from Android

chrome/common/metrics/experiments_helper.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 "chrome/common/metrics/experiments_helper.h"
 
 #include <map>
 #include <vector>
 
 #include "base/memory/singleton.h"
@@ skipping 138 matching lines @@
   }
   if (!current_chunk.empty())
     chunks->push_back(current_chunk);
 }
 
 void SetChildProcessLoggingExperimentList() {
   std::vector<SelectedGroupId> name_group_ids;
   GetFieldTrialSelectedGroupIds(&name_group_ids);
   std::vector<string16> experiment_strings(name_group_ids.size());
   for (size_t i = 0; i < name_group_ids.size(); ++i) {
-    // Wish there was a StringPrintf for string16... :-(
-    experiment_strings[i] = WideToUTF16(base::StringPrintf(
-        L"%x-%x", name_group_ids[i].name, name_group_ids[i].group));
+    experiment_strings[i] = UTF8ToUTF16(base::StringPrintf(
+        "%x-%x", name_group_ids[i].name, name_group_ids[i].group));
   }
   child_process_logging::SetExperimentList(experiment_strings);
 }
 
 }  // namespace experiments_helper
 
 // Functions below are exposed for testing explicitly behind this namespace.
 // They simply wrap existing functions in this file.
 namespace testing {
 
 void TestGetFieldTrialSelectedGroupIdsForSelectedGroups(
     const base::FieldTrial::SelectedGroups& selected_groups,
     std::vector<experiments_helper::SelectedGroupId>* name_group_ids) {
   ::GetFieldTrialSelectedGroupIdsForSelectedGroups(selected_groups,
                                                    name_group_ids);
 }
 
 uint32 TestHashName(const std::string& name) {
   return ::HashName(name);
 }
 
 }  // namespace testing