Move JoinString to the base namespace

base/test/launcher/test_launcher_nacl_nonsfi.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 <inttypes.h>
 #include <stdio.h>
 
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 95 matching lines @@
     return std::string();
   }
 
   base::CommandLine GetCommandLineForChildGTestProcess(
       const std::vector<std::string>& test_names,
       const base::FilePath& output_file) override {
     base::CommandLine cmd_line(test_path_);
     cmd_line.AppendSwitchPath(
         switches::kTestLauncherOutput, output_file);
     cmd_line.AppendSwitchASCII(
-        base::kGTestFilterFlag, JoinString(test_names, ":"));
+        base::kGTestFilterFlag, base::JoinString(test_names, ":"));
     return cmd_line;
   }
 
   void RelaunchTests(base::TestLauncher* test_launcher,
                      const std::vector<std::string>& test_names,
                      int launch_flags) override {
     RunUnitTestsBatch(test_launcher, this, test_names, launch_flags);
   }
 
   base::FilePath test_path_;
@@ skipping 24 matching lines @@
   base::TestLauncher launcher(&delegate, base::SysInfo::NumberOfProcessors());
   bool success = launcher.Run();
 
   fprintf(stdout, "Tests took %" PRId64 " seconds.\n",
           (base::TimeTicks::Now() - start_time).InSeconds());
   fflush(stdout);
   return success ? 0 : 1;
 }
 
 }  // namespace base