input: Remove dead code.

content/test/test_render_view_host.h

Index: content/test/test_render_view_host.h
diff --git a/content/test/test_render_view_host.h b/content/test/test_render_view_host.h
index 66ad13395c328d2433fb1f4e505e6429addc974c..b923434ed6ad620adcab791bafdf5bd1d930b975 100644
--- a/content/test/test_render_view_host.h
+++ b/content/test/test_render_view_host.h
@@ -107,7 +107,6 @@ class TestRenderWidgetHostView : public RenderWidgetHostViewBase {
   void Focus() override {}
   void SetIsLoading(bool is_loading) override {}
   void UpdateCursor(const WebCursor& cursor) override {}
-  void OnSetNeedsFlushInput() override {}
   void RenderProcessGone(base::TerminationStatus status,
                          int error_code) override;
   void Destroy() override;