Fix for single-process WebUI transition CHECK failure.

content/browser/frame_host/render_frame_host_manager.cc

Index: content/browser/frame_host/render_frame_host_manager.cc
diff --git a/content/browser/frame_host/render_frame_host_manager.cc b/content/browser/frame_host/render_frame_host_manager.cc
index cd85433714fe8f693e255ef4be2f90db85e957f3..14edd34995514518484f8250e791150284e14dbf 100644
--- a/content/browser/frame_host/render_frame_host_manager.cc
+++ b/content/browser/frame_host/render_frame_host_manager.cc
@@ -1758,8 +1758,9 @@ bool RenderFrameHostManager::InitRenderView(
     render_view_host->AllowBindings(dest_web_ui->GetBindings());
   } else {
     // Ensure that we don't create an unprivileged RenderView in a WebUI-enabled
-    // process unless it's swapped out.
-    if (render_view_host->is_active()) {
+    // process unless it's swapped out or we run in single-process mode.
+    if (render_view_host->is_active()
+        && !RenderProcessHost::run_renderer_in_process()) {
       CHECK(!ChildProcessSecurityPolicyImpl::GetInstance()->HasWebUIBindings(
                 render_view_host->GetProcess()->GetID()));
     }