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

third_party/WebKit/public/platform/WebPrescientNetworking.h

Index: third_party/WebKit/public/platform/WebPrescientNetworking.h
diff --git a/third_party/WebKit/public/platform/WebPrescientNetworking.h b/third_party/WebKit/public/platform/WebPrescientNetworking.h
index 8fa85422e3148a8553f894c8d1eb5ac85a25cd06..3d1fe474519d47d0b0c0cbf87b1002eff2f1f13b 100644
--- a/third_party/WebKit/public/platform/WebPrescientNetworking.h
+++ b/third_party/WebKit/public/platform/WebPrescientNetworking.h
@@ -37,8 +37,6 @@
 
 namespace blink {
 
-enum class WebNavigationHintType;
-
 class WebPrescientNetworking {
  public:
   virtual ~WebPrescientNetworking() {}
@@ -48,9 +46,6 @@ class WebPrescientNetworking {
   virtual void prefetchDNS(const WebString& hostname) {}
 
   virtual void preconnect(const WebURL& url, const bool allowCredentials) {}
-
-  // Send a hint that a navigation to |url| is likely to happen.
-  virtual void sendNavigationHint(const WebURL& url, WebNavigationHintType) {}
 };
 
 }  // namespace blink