Revert of Move JoinString to the base namespace

extensions/common/url_pattern.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 "extensions/common/url_pattern.h"
 
 #include <ostream>
 
 #include "base/strings/pattern.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 231 matching lines @@
 
     // Could be empty if the host only consists of whitespace characters.
     if (host_components.empty())
       return PARSE_ERROR_EMPTY_HOST;
 
     if (host_components[0] == "*") {
       match_subdomains_ = true;
       host_components.erase(host_components.begin(),
                             host_components.begin() + 1);
     }
-    host_ = base::JoinString(host_components, ".");
+    host_ = JoinString(host_components, '.');
 
     path_start_pos = host_end_pos;
   }
 
   SetPath(pattern.substr(path_start_pos));
 
   size_t port_pos = host_.find(':');
   if (port_pos != std::string::npos) {
     if (!SetPort(host_.substr(port_pos + 1)))
       return PARSE_ERROR_INVALID_PORT;
@@ skipping 343 matching lines @@
   }
 
   return result;
 }
 
 // static
 const char* URLPattern::GetParseResultString(
     URLPattern::ParseResult parse_result) {
   return kParseResultMessages[parse_result];
 }