Changed RefCountedStaticMemory() to accept a void pointer.

chrome/browser/ui/webui/ntp/thumbnail_list_source.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 "chrome/browser/ui/webui/ntp/thumbnail_list_source.h"
 
 #include <string>
 
 #include "base/base64.h"
 #include "base/bind.h"
@@ skipping 111 matching lines @@
     const content::URLDataSource::GotDataCallback& callback,
     const history::MostVisitedURLList& mvurl_list) {
   const size_t num_mv = mvurl_list.size();
   size_t num_mv_with_thumb = 0;
 
   // Encode all available thumbnails and store into |base64_encoded_pngs|.
   std::vector<std::string> base64_encoded_pngs(num_mv);
   for (size_t i = 0; i < num_mv; ++i) {
     scoped_refptr<base::RefCountedMemory> data;
     if (thumbnail_service_->GetPageThumbnail(mvurl_list[i].url, false, &data)) {
-      std::string data_str;
-      data_str.assign(reinterpret_cast<const char*>(data->front()),
-                      data->size());
-      base::Base64Encode(data_str, &base64_encoded_pngs[i]);
+      base::Base64Encode(std::string(data->front_as<char>(), data->size()),
+                         &base64_encoded_pngs[i]);
       ++num_mv_with_thumb;
     }
   }
 
   // Render HTML to embed URLs and thumbnails.
   std::vector<std::string> out;
   out.push_back(html_header);
   out.push_back(html_body);
   if (num_mv_with_thumb > 0) {
     out.push_back("<h2>TopSites URLs with Thumbnails</h2>\n");
     RenderMostVisitedURLList(mvurl_list, base64_encoded_pngs, true, &out);
   }
   if (num_mv_with_thumb < num_mv) {
     out.push_back("<h2>TopSites URLs without Thumbnails</h2>\n");
     RenderMostVisitedURLList(mvurl_list, base64_encoded_pngs, false, &out);
   }
   out.push_back(html_footer);
 
   std::string out_html = JoinString(out, "");
   callback.Run(base::RefCountedString::TakeString(&out_html));
 }