input: Remove dead code.

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 3c04bec5bc1bd53d306f0df37b0d4be7c2e61e50..01dc8ada602b1f68dbcad91792477ae9c589db64 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -492,11 +492,6 @@ void RenderWidgetHostImpl::SendScreenRects() {
   waiting_for_screen_rects_ack_ = true;
 }
 
-void RenderWidgetHostImpl::OnBeginFrame() {
-  if (begin_frame_callback_)
-    std::move(begin_frame_callback_).Run();
-}
-
 void RenderWidgetHostImpl::Init() {
   DCHECK(process_->HasConnection());
 
@@ -2548,13 +2543,6 @@ void RenderWidgetHostImpl::RequestMojoCompositorFrameSink(
   renderer_compositor_frame_sink_ = std::move(client);
 }
 
-void RenderWidgetHostImpl::RequestBeginFrameForSynthesizedInput(
-    base::OnceClosure begin_frame_callback) {
-  DCHECK(view_);
-  begin_frame_callback_ = std::move(begin_frame_callback);
-  view_->OnSetNeedsFlushInput();
-}
-
 bool RenderWidgetHostImpl::HasGestureStopped() {
   return !input_router_->HasPendingEvents();
 }