Move JoinString to the base namespace

chrome/browser/search/suggestions/suggestions_source.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 "chrome/browser/search/suggestions/suggestions_source.h"
 
 #include <vector>
 
 #include "base/barrier_closure.h"
 #include "base/base64.h"
@@ skipping 60 matching lines @@
       line += it->second;
       line += "'>";
     }
     line += "</a> Expires in ";
     line += base::UTF16ToUTF8(remaining_time_formatted);
     line += "</li>\n";
     out.push_back(line);
   }
   out.push_back("</ul>");
   out.push_back(kHtmlFooter);
-  *output = JoinString(out, "");
+  *output = base::JoinString(out, base::StringPiece());
 }
 
 // Fills |output| with the HTML needed to display that no suggestions are
 // available.
 void RenderOutputHtmlNoSuggestions(std::string* output) {
   std::vector<std::string> out;
   out.push_back(kHtmlHeader);
   out.push_back(kHtmlBody);
   out.push_back("<h1>Suggestions</h1>\n");
   out.push_back("<p>You have no suggestions.</p>\n");
   out.push_back(kHtmlFooter);
-  *output = JoinString(out, "");
+  *output = base::JoinString(out, base::StringPiece());
 }
 
 }  // namespace
 
 SuggestionsSource::SuggestionsSource(Profile* profile)
     : profile_(profile), weak_ptr_factory_(this) {}
 
 SuggestionsSource::~SuggestionsSource() {}
 
 SuggestionsSource::RequestContext::RequestContext(
@@ skipping 86 matching lines @@
     std::string encoded_output;
     base::Base64Encode(std::string(output.begin(), output.end()),
                        &encoded_output);
     context->base64_encoded_pngs[url] = "data:image/png;base64,";
     context->base64_encoded_pngs[url] += encoded_output;
   }
   barrier.Run();
 }
 
 }  // namespace suggestions