Nasty hack to pick the right origin for a sheet above an app window.

chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm

Index: chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm
diff --git a/chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm b/chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm
index 41a5a177b113ed9ba130122f438582f5b9c05433..458ef405fdfe5a13dec4355907afcd2cc8af8c99 100644
--- a/chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm
+++ b/chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm
@@ -2314,5 +2314,9 @@ NSRect GetSheetParentBoundsForParentView(NSView* view) {
   // the devtools view is always in the hierarchy even if it is not open or it
   // is detached.
   NSView* devtools_view = [[[view superview] superview] superview];
-  return [devtools_view convertRect:[devtools_view bounds] toView:nil];
+  if (devtools_view) {
+    return [devtools_view convertRect:[devtools_view bounds] toView:nil];
+  } else {
+    return [view convertRect:[view bounds] toView:nil];
+  }
 }