[DevTools] Unpause renderer when paused RenderFrame is closed.

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 e3c2602b74c8bdd7d6976db1f6e2ee47f5720cf1..6bac8260f1efd11cb6b6be6db4d72be1d6748db1 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -854,6 +854,7 @@ void RenderWidget::SetWindowRectSynchronously(
 void RenderWidget::OnClose() {
   if (closing_)
     return;
+  NotifyOnClose();
   closing_ = true;
 
   // Browser correspondence is no longer needed at this point.
@@ -1537,6 +1538,10 @@ void RenderWidget::DoDeferredClose() {
   Send(new ViewHostMsg_Close(routing_id_));
 }
 
+void RenderWidget::NotifyOnClose() {
+  FOR_EACH_OBSERVER(RenderFrameImpl, render_frames_, WidgetWillClose());
+}
+
 void RenderWidget::closeWidgetSoon() {
   if (is_swapped_out_) {
     // This widget is currently swapped out, and the active widget is in a