NTP: simplify mojo connection setup

chrome/renderer/searchbox/searchbox.cc

Index: chrome/renderer/searchbox/searchbox.cc
diff --git a/chrome/renderer/searchbox/searchbox.cc b/chrome/renderer/searchbox/searchbox.cc
index 41a44b62773bc1e543dce3ed587373d20e5c9355..42635315bcd9aa4f98130c6d016a721fd77eb89f 100644
--- a/chrome/renderer/searchbox/searchbox.cc
+++ b/chrome/renderer/searchbox/searchbox.cc
@@ -244,10 +244,14 @@ SearchBox::SearchBox(content::RenderFrame* render_frame)
       most_visited_items_cache_(kMaxInstantMostVisitedItemCacheSize),
       query_(),
       binding_(this) {
-  render_frame->GetRemoteAssociatedInterfaces()->GetInterface(
-      &instant_service_);
-  render_frame->GetAssociatedInterfaceRegistry()->AddInterface(
-      base::Bind(&SearchBox::Bind, base::Unretained(this)));
+  // Connect to the NTP interface in the browser.
+  chrome::mojom::NTPConnectorAssociatedPtr ntp_connector;
+  render_frame->GetRemoteAssociatedInterfaces()->GetInterface(&ntp_connector);
+  chrome::mojom::SearchBoxAssociatedPtrInfo search_box;
+  binding_.Bind(&search_box, ntp_connector.associated_group());
+  ntp_connector->Connect(
+      mojo::MakeRequest(&instant_service_, ntp_connector.associated_group()),
+      std::move(search_box));
 }
 
 SearchBox::~SearchBox() {