Make window.open() IPCs be frame-based

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 4c0fda13bb72976e3dd52db55248cf0bf05495d2..520a56a8ce0be1b86792a50c90ee78a380788b85 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -1355,6 +1355,7 @@ void RenderWidget::show(WebNavigationPolicy policy) {
 
   // The opener is responsible for actually showing this widget.
   show_callback_.Run(this, policy, initial_rect_);
+  show_callback_.Reset();
 
   // NOTE: initial_rect_ may still have its default values at this point, but
   // that's okay.  It'll be ignored if as_popup is false, or the browser