Fix NTP thumbnail generation

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index df4cade6a9f985f7d296cc392c7a31c3be86e90b..6cc8a80b5ca970071798ac4c6277713aee35fcfe 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -945,10 +945,7 @@ void RenderWidgetHostViewMac::WasOccluded() {
   // Note that the following call to WasHidden() can trigger thumbnail
   // generation on behalf of the NTP, and that cannot succeed if the browser
   // compositor view has been suspended. Therefore these two statements must
-  // occur in this specific order. However, because thumbnail generation is
-  // asychronous, that operation won't run before SuspendBrowserCompositorView()
-  // completes. As a result you won't get a thumbnail for the page unless you
-  // happen to switch back to it. See http://crbug.com/530707 .
+  // occur in this specific order.
   render_widget_host_->WasHidden();
   SuspendBrowserCompositorView();
 }