Use container::back() and container::pop_back() for content.

content/browser/renderer_host/pepper/pepper_internal_file_ref_backend.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 "content/browser/renderer_host/pepper/pepper_internal_file_ref_backend.h"
 
 #include <string.h>
 
 #include <string>
 
@@ skipping 215 matching lines @@
       accumulated_file_list->end(), file_list.begin(), file_list.end());
   if (has_more)
     return;
 
   context.params.set_result(ppapi::FileErrorToPepperError(error));
 
   std::vector<ppapi::FileRefCreateInfo> infos;
   std::vector<PP_FileType> file_types;
   if (error == base::File::FILE_OK && fs_host_.get()) {
     std::string dir_path = path_;
-    if (dir_path.empty() || dir_path[dir_path.size() - 1] != '/')
+    if (dir_path.empty() || dir_path.back() != '/')
       dir_path += '/';
 
-    for (storage::FileSystemOperation::FileEntryList::const_iterator it =
-             accumulated_file_list->begin();
-         it != accumulated_file_list->end();
-         ++it) {
-      if (it->is_directory)
-        file_types.push_back(PP_FILETYPE_DIRECTORY);
-      else
-        file_types.push_back(PP_FILETYPE_REGULAR);
+    for (const auto& it : *accumulated_file_list) {
+      file_types.push_back(it.is_directory ? PP_FILETYPE_DIRECTORY
+                                           : PP_FILETYPE_REGULAR);
 
       ppapi::FileRefCreateInfo info;
       info.file_system_type = fs_type_;
       info.file_system_plugin_resource = fs_host_->pp_resource();
       std::string path =
-          dir_path + storage::FilePathToString(base::FilePath(it->name));
+          dir_path + storage::FilePathToString(base::FilePath(it.name));
       info.internal_path = path;
       info.display_name = ppapi::GetNameForInternalFilePath(path);
       infos.push_back(info);
     }
   }
 
   host_->SendReply(
       context,
       PpapiPluginMsg_FileRef_ReadDirectoryEntriesReply(infos, file_types));
 }
@@ skipping 45 matching lines @@
   ChildProcessSecurityPolicyImpl* policy =
       ChildProcessSecurityPolicyImpl::GetInstance();
   if (!policy->CanReadFileSystemFile(render_process_id_, url) ||
       !policy->CanWriteFileSystemFile(render_process_id_, url)) {
     return PP_ERROR_NOACCESS;
   }
   return PP_OK;
 }
 
 }  // namespace content