input: Remove now dead code.

content/browser/renderer_host/render_widget_host_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <tuple>
 
@@ skipping 117 matching lines @@
   void SendTouchEvent(const TouchEventWithLatencyInfo& touch_event) override {
     send_touch_event_not_cancelled_ =
         client_->FilterInputEvent(touch_event.event, touch_event.latency) ==
         INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
   }
   const NativeWebKeyboardEvent* GetLastKeyboardEvent() const override {
     NOTREACHED();
     return NULL;
   }
   void NotifySiteIsMobileOptimized(bool is_mobile_optimized) override {}
-  void RequestNotificationWhenFlushed() override {}
   bool HasPendingEvents() const override { return false; }
   void SetDeviceScaleFactor(float device_scale_factor) override {}
   void SetFrameTreeNodeId(int frameTreeNodeId) override {}
 
   // IPC::Listener
   bool OnMessageReceived(const IPC::Message& message) override {
     message_received_ = true;
     return false;
   }
 
@@ skipping 2007 matching lines @@
   EXPECT_EQ(0u, host_->processed_frame_messages_count());
 
   frame = MakeCompositorFrame(1.f, frame_size);
   frame.metadata.frame_token = frame_token3;
   host_->SubmitCompositorFrame(local_surface_id, std::move(frame));
   EXPECT_EQ(0u, host_->queued_messages_.size());
   EXPECT_EQ(1u, host_->processed_frame_messages_count());
 }
 
 }  // namespace content