Revert of "Speculatively launch Service Workers on mouse/touch events."

components/network_hints/renderer/prescient_networking_dispatcher.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_RENDERER_PRESCIENT_NETWORKING_DISPATCHER_H_
 #define COMPONENTS_NETWORK_HINTS_RENDERER_PRESCIENT_NETWORKING_DISPATCHER_H_
 
 #include "base/macros.h"
 #include "components/network_hints/renderer/renderer_dns_prefetch.h"
 #include "components/network_hints/renderer/renderer_preconnect.h"
 #include "third_party/WebKit/public/platform/WebPrescientNetworking.h"
 
-namespace blink {
-enum class WebNavigationHintType;
-}
-
 namespace network_hints {
 
 // The main entry point from blink for sending DNS prefetch requests to the
 // network stack.
 class PrescientNetworkingDispatcher : public blink::WebPrescientNetworking {
  public:
   PrescientNetworkingDispatcher();
   ~PrescientNetworkingDispatcher() override;
 
   void prefetchDNS(const blink::WebString& hostname) override;
   void preconnect(const blink::WebURL& url,
                   const bool allow_credentials) override;
-  void sendNavigationHint(const blink::WebURL& url,
-                          blink::WebNavigationHintType type) override;
 
  private:
   network_hints::RendererDnsPrefetch dns_prefetch_;
   network_hints::RendererPreconnect preconnect_;
 
   DISALLOW_COPY_AND_ASSIGN(PrescientNetworkingDispatcher);
 };
 
 }   // namespace network_hints
 
 #endif  // COMPONENTS_NETWORK_HINTS_RENDERER_PRESCIENT_NETWORKING_DISPATCHER_H_