input: Remove now dead code.

content/browser/renderer_host/render_widget_host_unittest.cc

Index: content/browser/renderer_host/render_widget_host_unittest.cc
diff --git a/content/browser/renderer_host/render_widget_host_unittest.cc b/content/browser/renderer_host/render_widget_host_unittest.cc
index 57609963dc9ed53da316971a5d04f67d028d755a..7fdd5f2ecaf5e99502e0ef8bc3d8165fb5273416 100644
--- a/content/browser/renderer_host/render_widget_host_unittest.cc
+++ b/content/browser/renderer_host/render_widget_host_unittest.cc
@@ -135,7 +135,6 @@ class MockInputRouter : public InputRouter {
     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 {}