Protect status_area_ access

chrome/browser/chromeos/login/webui_login_view.cc

 // Copyright (c) 2011 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 "chrome/browser/chromeos/login/webui_login_view.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/i18n/rtl.h"
 #include "base/utf_string_conversions.h"
@@ skipping 251 matching lines @@
 
 gfx::Font WebUILoginView::GetStatusAreaFont(const gfx::Font& font) const {
   return font;
 }
 
 StatusAreaButton::TextStyle WebUILoginView::GetStatusAreaTextStyle() const {
   return StatusAreaButton::GRAY_PLAIN;
 }
 
 void WebUILoginView::ButtonVisibilityChanged(views::View* button_view) {
-  status_area_->UpdateButtonVisibility();
+  if (status_area_)
+    status_area_->UpdateButtonVisibility();
 }
 
 void WebUILoginView::OnRenderHostCreated(RenderViewHost* host) {
   new SnifferObserver(host, GetWebUI());
 }
 
 void WebUILoginView::OnTabMainFrameLoaded() {
   VLOG(1) << "WebUI login main frame loaded.";
 }
 
@@ skipping 121 matching lines @@
   // when the focus is inside an iframe. Only clear on KeyDown to prevent hiding
   // an immediate authentication error (See crbug.com/103643).
   if (event.type == WebKit::WebInputEvent::KeyDown) {
     WebUI* web_ui = GetWebUI();
     if (web_ui)
       web_ui->CallJavascriptFunction("cr.ui.Oobe.clearErrors");
   }
 }
 
 }  // namespace chromeos