Revert of Convert network hints to Mojo

components/network_hints/browser/network_hints_impl.h

-// 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 COMPONENTS_NETWORK_HINTS_BROWSER_NETWORK_HINTS_MESSAGE_FILTER_H_
-#define COMPONENTS_NETWORK_HINTS_BROWSER_NETWORK_HINTS_MESSAGE_FILTER_H_
-
-#include "base/macros.h"
-#include "components/network_hints/public/interfaces/network_hints.mojom.h"
-#include "mojo/public/cpp/bindings/binding_set.h"
-
-namespace net {
-class HostResolver;
-}
-
-namespace network_hints {
-struct LookupRequest;
-
-// Simple browser-side handler for DNS prefetch requests.
-// Passes prefetch requests to the provided net::HostResolver.
-// Each renderer process requires its own filter.
-class NetworkHintsImpl : public network_hints::mojom::NetworkHints {
- public:
-  explicit NetworkHintsImpl(net::HostResolver* host_resolver);
-  ~NetworkHintsImpl() override;
-
-  void Bind(mojo::InterfaceRequest<mojom::NetworkHints> request);
-
- private:
-  // network_hints::mojom::NetworkHints implementation:
-  void DNSPrefetch(const LookupRequest& lookup_request) override;
-  void Preconnect(const GURL& url,
-                  bool allow_credentials,
-                  int32_t count) override {}
-
-  net::HostResolver* host_resolver_;
-
-  mojo::BindingSet<mojom::NetworkHints> bindings_;
-
-  DISALLOW_COPY_AND_ASSIGN(NetworkHintsImpl);
-};
-
-}  // namespace network_hints
-
-#endif  // COMPONENTS_NETWORK_HINTS_BROWSER_NETWORK_HINTS_MESSAGE_FILTER_H_