Speculative fix for DelegatedFrameHost destructor crashes

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 593a4ac533fabc01b8683dde775bf998409104c6..1ae110cfaf49c4e269e8c10c3efd00159d101958 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -979,6 +979,13 @@ void RenderWidgetHostViewMac::RenderProcessGone(base::TerminationStatus status,
   Destroy();
 }
 
+void RenderWidgetHostViewMac::RenderWidgetHostGone() {
+  // Destroy the DelegatedFrameHost, to prevent crashes when Destroy is never
+  // called on the view.
+  // http://crbug.com/404828
+  ShutdownBrowserCompositor();
+}
+
 void RenderWidgetHostViewMac::Destroy() {
   [[NSNotificationCenter defaultCenter]
       removeObserver:cocoa_view_