Implement WebUI extension via gin instead of v8::Extension

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index ef64a94a8d5cf2e4035cbdb22bda5ee8618cb9be..aa1b1f9ccf9e7616c226df4e1fa0fc64e146225b 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -3294,6 +3294,9 @@ void RenderViewImpl::didClearWindowObject(WebFrame* frame, int world_id) {
   if (world_id)
     return;
 
+  if (enabled_bindings_& BINDINGS_POLICY_WEB_UI)
+    WebUIExtension::Install(frame);
+
   if (enabled_bindings_ & BINDINGS_POLICY_DOM_AUTOMATION)
     DomAutomationController::Install(this, frame);
 
@@ -4333,8 +4336,6 @@ void RenderViewImpl::OnAllowBindings(int enabled_bindings_flags) {
       !(enabled_bindings_ & BINDINGS_POLICY_WEB_UI)) {
     // WebUI uses <dialog> which is not yet enabled by default in Chrome.
     WebRuntimeFeatures::enableDialogElement(true);
-
-    RenderThread::Get()->RegisterExtension(WebUIExtension::Get());
     new WebUIExtensionData(this);
   }