Fix Crash in KeyPressListenersHandleEvent

content/browser/renderer_host/render_widget_host_view_gtk.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_gtk.h"
 
 // If this gets included after the gtk headers, then a bunch of compiler
 // errors happen because of a "#define Status int" in Xlib.h, which interacts
 // badly with net::URLRequestStatus::Status.
 #include "content/common/view_messages.h"
@@ skipping 195 matching lines @@
   static gboolean OnKeyPressReleaseEvent(GtkWidget* widget,
                                          GdkEventKey* event,
                                          RenderWidgetHostViewGtk* host_view) {
     // Force popups or fullscreen windows to close on Escape so they won't keep
     // the keyboard grabbed or be stuck onscreen if the renderer is hanging.
     bool should_close_on_escape =
         (host_view->IsPopup() && host_view->NeedsInputGrab()) ||
         host_view->is_fullscreen_;
     if (should_close_on_escape && GDK_Escape == event->keyval) {
       host_view->host_->Shutdown();
-    } if (host_view->host_->KeyPressListenersHandleEvent(event)) {
+    } if (host_view->host_ &&
+          host_view->host_->KeyPressListenersHandleEvent(event)) {
       return TRUE;
     } else {
       // Send key event to input method.
       host_view->im_context_->ProcessKeyEvent(event);
     }
 
     // We return TRUE because we did handle the event. If it turns out webkit
     // can't handle the event, we'll deal with it in
     // RenderView::UnhandledKeyboardEvent().
     return TRUE;
@@ skipping 1207 matching lines @@
   return new RenderWidgetHostViewGtk(widget);
 }
 
 // static
 void content::RenderWidgetHostViewPort::GetDefaultScreenInfo(
     WebKit::WebScreenInfo* results) {
   GdkWindow* gdk_window =
       gdk_display_get_default_group(gdk_display_get_default());
   content::GetScreenInfoFromNativeWindow(gdk_window, results);
 }