Fix crash in taking a screenshot of a closed popup

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index 56e655c833d3b50b91df83e730f706f82d5756d5..d06095ea44dbee673f3d56c3d4574b3063ad249d 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -798,9 +798,14 @@ void RenderWidgetCompositor::Layout() {
   widget_->webwidget()->layout();
 
   if (temporary_copy_output_request_) {
-    DCHECK(layer_tree_host_->root_layer());
-    layer_tree_host_->root_layer()->RequestCopyOfOutput(
-        temporary_copy_output_request_.Pass());
+    // For WebViewImpl cases, this will always have a root layer.
+    // For other widgets, the widget may be closed before servicing this
+    // request, so ignore it.
+    if (cc::Layer* root_layer = layer_tree_host_->root_layer())
+      root_layer->RequestCopyOfOutput(temporary_copy_output_request_.Pass());
+    else
+      temporary_copy_output_request_->SendEmptyResult();
+      temporary_copy_output_request_ = nullptr;

[piman, 2015/03/26 23:09:58]

nit: wrong indent, or did you forget brackets?
(it doesn't appear to make a functional difference)

[enne (OOO), 2015/03/27 17:40:52]

Last minute edit; forgot brackets.  <_<

*blush*

   }
 }