input: Remove now dead code.

content/browser/renderer_host/input/input_router_impl.h

Index: content/browser/renderer_host/input/input_router_impl.h
diff --git a/content/browser/renderer_host/input/input_router_impl.h b/content/browser/renderer_host/input/input_router_impl.h
index d26663a0a4f312fa2801cd7c1c60ac30ad3479f1..3c25826bc0e7aa292401f71f99061da2f1a3e41d 100644
--- a/content/browser/renderer_host/input/input_router_impl.h
+++ b/content/browser/renderer_host/input/input_router_impl.h
@@ -73,7 +73,6 @@ class CONTENT_EXPORT InputRouterImpl
   void SendTouchEvent(const TouchEventWithLatencyInfo& touch_event) override;
   const NativeWebKeyboardEvent* GetLastKeyboardEvent() const override;
   void NotifySiteIsMobileOptimized(bool is_mobile_optimized) override;
-  void RequestNotificationWhenFlushed() override;
   bool HasPendingEvents() const override;
   void SetDeviceScaleFactor(float device_scale_factor) override;
 
@@ -202,10 +201,6 @@ class CONTENT_EXPORT InputRouterImpl
   // non-zero touch timeout configuration.
   void UpdateTouchAckTimeoutEnabled();
 
-  // If a flush has been requested, signals a completed flush to the client if
-  // all events have been dispatched (i.e., |HasPendingEvents()| is false).
-  void SignalFlushedIfNecessary();
-
   int routing_id() const { return routing_id_; }
 
   IPC::Sender* sender_;
@@ -243,10 +238,6 @@ class CONTENT_EXPORT InputRouterImpl
   // Defaults to ACK_SOURCE_NONE.
   AckSource current_ack_source_;
 
-  // Whether a call to |Flush()| has yet been accompanied by a |DidFlush()| call
-  // to the client_ after all events have been dispatched/acked.
-  bool flush_requested_;
-
   // Whether there are any active flings in the renderer. As the fling
   // end notification is asynchronous, we use a count rather than a boolean
   // to avoid races in bookkeeping when starting a new fling.