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

components/network_hints/renderer/prescient_networking_dispatcher.cc

Index: components/network_hints/renderer/prescient_networking_dispatcher.cc
diff --git a/components/network_hints/renderer/prescient_networking_dispatcher.cc b/components/network_hints/renderer/prescient_networking_dispatcher.cc
index 7284bc2f5bbb74e84a0826338fd59d58236b7ce1..a5145ac48b9fd03475e15bfe59c8441df9e21d09 100644
--- a/components/network_hints/renderer/prescient_networking_dispatcher.cc
+++ b/components/network_hints/renderer/prescient_networking_dispatcher.cc
@@ -5,10 +5,6 @@
 #include "components/network_hints/renderer/prescient_networking_dispatcher.h"
 
 #include "base/logging.h"
-#include "components/network_hints/common/network_hints_messages.h"
-#include "content/public/renderer/render_thread.h"
-
-using content::RenderThread;
 
 namespace network_hints {
 
@@ -34,12 +30,4 @@ void PrescientNetworkingDispatcher::preconnect(const blink::WebURL& url,
   preconnect_.Preconnect(url, allow_credentials);
 }
 
-void PrescientNetworkingDispatcher::sendNavigationHint(
-    const blink::WebURL& url,
-    blink::WebNavigationHintType type) {
-  if (!url.isValid())
-    return;
-  RenderThread::Get()->Send(new NetworkHintsMsg_NavigationHint(url, type));
-}
-
 }  // namespace network_hints