Speculative fix for DelegatedFrameHost destructor crashes

content/browser/renderer_host/render_widget_host_view_mac.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_mac.h"
 
 #import <objc/runtime.h>
 #include <OpenGL/gl.h>
 #include <QuartzCore/QuartzCore.h>
 
@@ skipping 961 matching lines @@
   [cocoa_view_ setMarkedRange:range.ToNSRange()];
   composition_range_ = range;
   composition_bounds_ = character_bounds;
 }
 
 void RenderWidgetHostViewMac::RenderProcessGone(base::TerminationStatus status,
                                                 int error_code) {
   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_
                 name:NSWindowWillCloseNotification
               object:popup_window_];
 
   // We've been told to destroy.
   [cocoa_view_ retain];
   [cocoa_view_ removeFromSuperview];
   [cocoa_view_ autorelease];
@@ skipping 2345 matching lines @@
 
 // "-webkit-app-region: drag | no-drag" is implemented on Mac by excluding
 // regions that are not draggable. (See ControlRegionView in
 // native_app_window_cocoa.mm). This requires the render host view to be
 // draggable by default.
 - (BOOL)mouseDownCanMoveWindow {
   return YES;
 }
 
 @end