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

content/browser/appcache/appcache_internals_ui.cc

 // Copyright 2015 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/appcache/appcache_internals_ui.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 247 matching lines @@
         BrowserThread::IO, FROM_HERE,
         base::Bind(&Proxy::RequestFileDetails, this, response_enquiry));
     return;
   }
   DCHECK(!shutdown_called_);
   response_enquiries_.push_back(response_enquiry);
   HandleFileDetailsRequest();
 }
 
 void AppCacheInternalsUI::Proxy::HandleFileDetailsRequest() {
-  if (preparing_response_ || !response_enquiries_.size() || !appcache_service_)
+  if (preparing_response_ || response_enquiries_.empty() || !appcache_service_)
     return;
   preparing_response_ = true;
   appcache_service_->storage()->LoadResponseInfo(
       GURL(response_enquiries_.front().manifest_url),
       response_enquiries_.front().response_id, this);
 }
 
 void AppCacheInternalsUI::Proxy::OnResponseInfoLoaded(
     AppCacheResponseInfo* response,
     int64_t response_id) {
@@ skipping 223 matching lines @@
     const base::FilePath& partition_path) {
   for (const scoped_refptr<Proxy>& proxy : appcache_proxies_) {
     if (proxy->partition_path_ == partition_path)
       return proxy.get();
   }
   NOTREACHED();
   return nullptr;
 }
 
 }  // namespace content