Revert of Move JoinString to the base namespace

base/test/launcher/test_launcher.cc

 // Copyright 2013 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 "base/test/launcher/test_launcher.h"
 
 #if defined(OS_POSIX)
 #include <fcntl.h>
 #endif
 
@@ skipping 552 matching lines @@
   if (print_snippet) {
     std::vector<std::string> snippet_lines;
     SplitStringDontTrim(result.output_snippet, '\n', &snippet_lines);
     if (snippet_lines.size() > kOutputSnippetLinesLimit) {
       size_t truncated_size = snippet_lines.size() - kOutputSnippetLinesLimit;
       snippet_lines.erase(
           snippet_lines.begin(),
           snippet_lines.begin() + truncated_size);
       snippet_lines.insert(snippet_lines.begin(), "<truncated>");
     }
-    fprintf(stdout, "%s", base::JoinString(snippet_lines, "\n").c_str());
+    fprintf(stdout, "%s", JoinString(snippet_lines, "\n").c_str());
     fflush(stdout);
   }
 
   if (result.status == TestResult::TEST_SUCCESS) {
     ++test_success_count_;
   } else {
     tests_to_retry_.insert(result.full_name);
   }
 
   results_tracker_.AddTestResult(result);
@@ skipping 487 matching lines @@
   }
 
   std::string snippet(full_output.substr(run_pos));
   if (end_pos != std::string::npos)
     snippet = full_output.substr(run_pos, end_pos - run_pos);
 
   return snippet;
 }
 
 }  // namespace base