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

content/browser/storage_partition_impl.cc

 // Copyright (c) 2012 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/storage_partition_impl.h"
 
 #include <stddef.h>
 
 #include <set>
 #include <vector>
@@ skipping 690 matching lines @@
     storage::QuotaManager* quota_manager,
     const scoped_refptr<storage::SpecialStoragePolicy>& special_storage_policy,
     const StoragePartition::OriginMatcherFunction& origin_matcher,
     const base::Closure& callback,
     const std::set<GURL>& origins,
     storage::StorageType quota_storage_type) {
   // The QuotaManager manages all storage other than cookies, LocalStorage,
   // and SessionStorage. This loop wipes out most HTML5 storage for the given
   // origins.
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
-  if (!origins.size()) {
+  if (origins.empty()) {
     callback.Run();
     return;
   }
 
   size_t* deletion_task_count = new size_t(0u);
   (*deletion_task_count)++;
   for (std::set<GURL>::const_iterator origin = origins.begin();
        origin != origins.end(); ++origin) {
     // TODO(mkwst): Clean this up, it's slow. http://crbug.com/130746
     if (!storage_origin.is_empty() && origin->GetOrigin() != storage_origin)
@@ skipping 196 matching lines @@
     net::URLRequestContextGetter* url_request_context) {
   url_request_context_ = url_request_context;
 }
 
 void StoragePartitionImpl::SetMediaURLRequestContext(
     net::URLRequestContextGetter* media_url_request_context) {
   media_url_request_context_ = media_url_request_context;
 }
 
 }  // namespace content