Revert "Track input latency while starting a ServiceWorker for a navigation hint."

content/browser/service_worker/service_worker_context_wrapper.h

Index: content/browser/service_worker/service_worker_context_wrapper.h
diff --git a/content/browser/service_worker/service_worker_context_wrapper.h b/content/browser/service_worker/service_worker_context_wrapper.h
index 33fa91c06cec11cfc34868dffb866c80780b7c0d..f308459bf6b65d3466aa6bfe0b61a37845f34577 100644
--- a/content/browser/service_worker/service_worker_context_wrapper.h
+++ b/content/browser/service_worker/service_worker_context_wrapper.h
@@ -227,9 +227,6 @@ class CONTENT_EXPORT ServiceWorkerContextWrapper
   // Must be called from the IO thread.
   bool OriginHasForeignFetchRegistrations(const GURL& origin);
 
-  // Must be called from the UI thread.
-  bool IsRunningNavigationHintTask(int render_process_id) const;
-
  private:
   friend class BackgroundSyncManagerTest;
   friend class base::RefCountedThreadSafe<ServiceWorkerContextWrapper>;
@@ -292,9 +289,6 @@ class CONTENT_EXPORT ServiceWorkerContextWrapper
                                               int render_process_id,
                                               const ResultCallback& callback,
                                               ServiceWorkerStatusCode code);
-  void DidFinishNavigationHintTaskOnUI(int render_process_id,
-                                       const ResultCallback& callback,
-                                       bool result);
 
   // The core context is only for use on the IO thread.
   // Can be null before/during init, during/after shutdown, and after
@@ -316,9 +310,6 @@ class CONTENT_EXPORT ServiceWorkerContextWrapper
   // The ResourceContext associated with this context.
   ResourceContext* resource_context_;
 
-  // Must be touched on the UI thread.
-  std::map<int, int> navigation_hint_task_count_per_process_;
-
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerContextWrapper);
 };