input: Remove now dead code.

content/browser/renderer_host/input/mock_input_router_client.h

Index: content/browser/renderer_host/input/mock_input_router_client.h
diff --git a/content/browser/renderer_host/input/mock_input_router_client.h b/content/browser/renderer_host/input/mock_input_router_client.h
index 463d7f694f44231c55dde8109cd836f33062760e..ed1072e200878f76be4c60f3819e4823f5e5fa51 100644
--- a/content/browser/renderer_host/input/mock_input_router_client.h
+++ b/content/browser/renderer_host/input/mock_input_router_client.h
@@ -30,7 +30,6 @@ class MockInputRouterClient : public InputRouterClient {
       blink::WebInputEvent::Type event_type) override;
   void DecrementInFlightEventCount(InputEventAckSource ack_source) override;
   void OnHasTouchEventHandlers(bool has_handlers) override;
-  void DidFlush() override;
   void DidOverscroll(const ui::DidOverscrollParams& params) override;
   void DidStopFlinging() override;
   void ForwardGestureEventWithLatencyInfo(
@@ -38,7 +37,6 @@ class MockInputRouterClient : public InputRouterClient {
       const ui::LatencyInfo& latency_info) override;
 
   bool GetAndResetFilterEventCalled();
-  size_t GetAndResetDidFlushCount();
   ui::DidOverscrollParams GetAndResetOverscroll();
 
   void set_input_router(InputRouter* input_router) {
@@ -69,8 +67,6 @@ class MockInputRouterClient : public InputRouterClient {
   bool filter_input_event_called_;
   std::unique_ptr<InputEvent> last_filter_event_;
 
-  size_t did_flush_called_count_;
-
   ui::DidOverscrollParams overscroll_;
 };