Revert of Move JoinString to the base namespace

chrome/common/extensions/command.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/extensions/command.h"
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
@@ skipping 254 matching lines @@
     return suggestion;
 
   std::vector<std::string> tokens;
   base::SplitString(suggestion, '+', &tokens);
   for (size_t i = 0; i < tokens.size(); i++) {
     if (tokens[i] == values::kKeyCtrl)
       tokens[i] = values::kKeyCommand;
     else if (tokens[i] == values::kKeyMacCtrl)
       tokens[i] = values::kKeyCtrl;
   }
-  return base::JoinString(tokens, "+");
+  return JoinString(tokens, '+');
 }
 
 }  // namespace
 
 Command::Command() : global_(false) {}
 
 Command::Command(const std::string& command_name,
                  const base::string16& description,
                  const std::string& accelerator,
                  bool global)
@@ skipping 260 matching lines @@
       accelerator_ = accelerator;
       command_name_ = command_name;
       description_ = description;
       global_ = global;
     }
   }
   return true;
 }
 
 }  // namespace extensions