Componentize renderer side of DNS prefetching.

components/dns_prefetch/common/prefetch_common.cc

Index: components/dns_prefetch/common/prefetch_common.cc
diff --git a/components/dns_prefetch/common/prefetch_common.cc b/components/dns_prefetch/common/prefetch_common.cc
new file mode 100644
index 0000000000000000000000000000000000000000..04d5ff26dd8059ae5aaf3f836088756a844c1ffd
--- /dev/null
+++ b/components/dns_prefetch/common/prefetch_common.cc
@@ -0,0 +1,18 @@
+// Copyright 2014 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 "components/dns_prefetch/common/prefetch_common.h"
+
+namespace dns_prefetch {
+
+const size_t kMaxDnsHostnamesPerRequest = 30;
+const size_t kMaxDnsHostnameLength = 255;
+
+LookupRequest::LookupRequest() {
+}
+
+LookupRequest::~LookupRequest() {
+}
+
+}  // namespace dns_prefetch