Move JoinString to the base namespace

content/browser/accessibility/dump_accessibility_browsertest_base.cc

 // Copyright 2014 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 "content/browser/accessibility/dump_accessibility_browsertest_base.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 184 matching lines @@
   std::vector<std::string> actual_lines = Dump();
 
   // Perform a diff (or write the initial baseline).
   std::vector<std::string> expected_lines = base::SplitString(
       expected_contents, "\n", base::KEEP_WHITESPACE,
       base::SPLIT_WANT_NONEMPTY);
   // Marking the end of the file with a line of text ensures that
   // file length differences are found.
   expected_lines.push_back(kMarkEndOfFile);
   actual_lines.push_back(kMarkEndOfFile);
-  std::string actual_contents = JoinString(actual_lines, "\n");
+  std::string actual_contents = base::JoinString(actual_lines, "\n");
 
   std::vector<int> diff_lines = DiffLines(expected_lines, actual_lines);
   bool is_different = diff_lines.size() > 0;
   EXPECT_FALSE(is_different);
   if (is_different) {
     OnDiffFailed();
 
     // Mark the expected lines which did not match actual output with a *.
     printf("* Line Expected\n");
     printf("- ---- --------\n");
@@ skipping 22 matching lines @@
     EXPECT_TRUE(base::WriteFile(
         actual_file, actual_contents.c_str(), actual_contents.size()));
 
     ADD_FAILURE() << "No expectation found. Create it by doing:\n"
                   << "mv " << actual_file.LossyDisplayName() << " "
                   << expected_file.LossyDisplayName();
   }
 }
 
 }  // namespace content