Use a direct include of strings headers in webkit/, part 1.

webkit/browser/appcache/appcache_storage_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 "webkit/browser/appcache/appcache_storage_impl.h"
 
 #include <algorithm>
 #include <functional>
 #include <set>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/stl_util.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "net/base/cache_type.h"
 #include "net/base/net_errors.h"
 #include "sql/connection.h"
 #include "sql/transaction.h"
 #include "webkit/browser/appcache/appcache.h"
 #include "webkit/browser/appcache/appcache_database.h"
 #include "webkit/browser/appcache/appcache_entry.h"
 #include "webkit/browser/appcache/appcache_group.h"
 #include "webkit/browser/appcache/appcache_histograms.h"
 #include "webkit/browser/appcache/appcache_quota_client.h"
@@ skipping 1782 matching lines @@
     if (!is_incognito_) {
       VLOG(1) << "Deleting existing appcache data and starting over.";
       db_thread_->PostTask(
           FROM_HERE, base::Bind(base::IgnoreResult(&file_util::Delete),
                                 cache_directory_, true));
     }
   }
 }
 
 }  // namespace appcache