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

webkit/browser/appcache/appcache.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.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "webkit/browser/appcache/appcache_group.h"
 #include "webkit/browser/appcache/appcache_host.h"
 #include "webkit/browser/appcache/appcache_storage.h"
 #include "webkit/common/appcache/appcache_interfaces.h"
 
 namespace appcache {
 
 AppCache::AppCache(AppCacheStorage* storage, int64 cache_id)
     : cache_id_(cache_id),
       owning_group_(NULL),
@@ skipping 257 matching lines @@
     const GURL& url) {
   size_t count = namespaces.size();
   for (size_t i = 0; i < count; ++i) {
     if (namespaces[i].IsMatch(url))
       return &namespaces[i];
   }
   return NULL;
 }
 
 }  // namespace appcache