Adds DNS prefetch support to Chromecast.

components/dns_prefetch/renderer/prescient_networking_dispatcher.h

-// Copyright 2013 The Chromium Authors. All rights reserved.
+// 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.
 
-#ifndef CHROME_RENDERER_NET_PRESCIENT_NETWORKING_DISPATCHER_H_
-#define CHROME_RENDERER_NET_PRESCIENT_NETWORKING_DISPATCHER_H_
+#ifndef COMPONENTS_DNS_PREFETCH_RENDERER_PRESCIENT_NETWORKING_DISPATCHER_H_
+#define COMPONENTS_DNS_PREFETCH_RENDERER_PRESCIENT_NETWORKING_DISPATCHER_H_
 
-#include "base/compiler_specific.h"
+#include "base/macros.h"
 #include "components/dns_prefetch/renderer/renderer_net_predictor.h"
 #include "third_party/WebKit/public/platform/WebPrescientNetworking.h"
 
+namespace dns_prefetch {
+
 class PrescientNetworkingDispatcher : public blink::WebPrescientNetworking {
  public:
   PrescientNetworkingDispatcher();
-  virtual ~PrescientNetworkingDispatcher();
+  ~PrescientNetworkingDispatcher() override;
 
-  virtual void prefetchDNS(const blink::WebString& hostname) override;
+  void prefetchDNS(const blink::WebString& hostname) override;
+
  private:
   dns_prefetch::RendererNetPredictor net_predictor_;
 
   DISALLOW_COPY_AND_ASSIGN(PrescientNetworkingDispatcher);
 };
 
-#endif  // CHROME_RENDERER_NET_PRESCIENT_NETWORKING_DISPATCHER_H_
+}   // namespace dns_prefetch
+
+#endif  // COMPONENTS_DNS_PREFETCH_RENDERER_PRESCIENT_NETWORKING_DISPATCHER_H_