Revert of Move JoinString to the base namespace

chrome/browser/extensions/chrome_content_verifier_delegate.cc

 // Copyright 2015 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/extensions/chrome_content_verifier_delegate.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
@@ skipping 117 matching lines @@
     const std::string& extension_id,
     const base::Version& version) {
   // TODO(asargent) Factor out common code from the extension updater's
   // ManifestFetchData class that can be shared for use here.
   std::vector<std::string> parts;
   parts.push_back("uc");
   parts.push_back("installsource=signature");
   parts.push_back("id=" + extension_id);
   parts.push_back("v=" + version.GetString());
   std::string x_value =
-      net::EscapeQueryParamValue(base::JoinString(parts, "&"), true);
+      net::EscapeQueryParamValue(JoinString(parts, "&"), true);
   std::string query = "response=redirect&x=" + x_value;
 
   GURL base_url = extension_urls::GetWebstoreUpdateUrl();
   GURL::Replacements replacements;
   replacements.SetQuery(query.c_str(), url::Component(0, query.length()));
   return base_url.ReplaceComponents(replacements);
 }
 
 std::set<base::FilePath> ChromeContentVerifierDelegate::GetBrowserImagePaths(
     const extensions::Extension* extension) {
@@ skipping 30 matching lines @@
 void ChromeContentVerifierDelegate::LogFailureForPolicyForceInstall(
     const std::string& extension_id) {
   if (!ContainsKey(corrupt_policy_extensions_, extension_id)) {
     corrupt_policy_extensions_.insert(extension_id);
     UMA_HISTOGRAM_BOOLEAN("Extensions.CorruptPolicyExtensionWouldBeDisabled",
                           true);
   }
 }
 
 }  // namespace extensions