SIGSEGV in content::RenderWidgetHostViewAura::ApplyEventFilterForPopupExit()

content/browser/renderer_host/render_widget_host_view_aura.cc

 // 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_aura.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 385 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(EventFilterForPopupExit);
 };
 
 void RenderWidgetHostViewAura::ApplyEventFilterForPopupExit(
     ui::MouseEvent* event) {
   if (in_shutdown_) {
     event_filter_for_popup_exit_.reset();
     return;
   }
-  if (is_fullscreen_ || event->type() != ui::ET_MOUSE_PRESSED ||
+  if (is_fullscreen_ || !event || event->type() != ui::ET_MOUSE_PRESSED ||

[Ben Goodger (Google), 2013/04/16 16:23:14]

Why is event NULL?

       !event->target())
     return;
 
   DCHECK(popup_parent_host_view_);
   aura::Window* target = static_cast<aura::Window*>(event->target());
   if (target != window_ && target != popup_parent_host_view_->window_) {
     event_filter_for_popup_exit_.reset();
     in_shutdown_ = true;
     host_->Shutdown();
   }
@@ skipping 2418 matching lines @@
     RenderWidgetHost* widget) {
   return new RenderWidgetHostViewAura(widget);
 }
 
 // static
 void RenderWidgetHostViewPort::GetDefaultScreenInfo(WebScreenInfo* results) {
   GetScreenInfoForWindow(results, NULL);
 }
 
 }  // namespace content