Destroy the old RenderWidgetHostView when swapping out a main frame.

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index 8025c71da8d2e87e350907864428a552ff12c2fd..cd1f83cba1ba9e586f562057e7da67ab41f35afb 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -1404,8 +1404,6 @@ void RenderFrameHostImpl::SwapOut(
   // TODO(nasko): If the frame is not live, the RFH should just be deleted by
   // simulating the receipt of swap out ack.
   is_waiting_for_swapout_ack_ = true;
-  if (frame_tree_node_->IsMainFrame())
-    render_view_host_->set_is_active(false);
 }
 
 void RenderFrameHostImpl::OnBeforeUnloadACK(
@@ -1572,13 +1570,6 @@ void RenderFrameHostImpl::OnSwappedOut() {
 
   ClearAllWebUI();
 
-  // If this is a main frame RFH that's about to be deleted, update its RVH's
-  // swapped-out state here. https://crbug.com/505887
-  if (frame_tree_node_->IsMainFrame()) {
-    render_view_host_->set_is_active(false);
-    render_view_host_->set_is_swapped_out(true);
-  }
-
   bool deleted =
       frame_tree_node_->render_manager()->DeleteFromPendingList(this);
   CHECK(deleted);