exhibit 1: explicit null checks

chrome/browser/ui/gtk/location_bar_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 "chrome/browser/ui/gtk/location_bar_view_gtk.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 798 matching lines @@
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_ACCESSIBILITY_CONTROL_FOCUSED,
       content::Source<Profile>(profile),
       content::Details<AccessibilityTextBoxInfo>(&info));
 
   // Update the keyword and search hint states.
   OnChanged();
 }
 
 SkBitmap LocationBarViewGtk::GetFavicon() const {
-  return GetTabContents()->favicon_tab_helper()->GetFavicon().AsBitmap();
+  const gfx::Image& icon = GetTabContents()->favicon_tab_helper()->GetFavicon();
+  return icon.IsEmpty() ? SkBitmap() : *icon.ToSkBitmap();
 }
 
 string16 LocationBarViewGtk::GetTitle() const {
   return GetWebContents()->GetTitle();
 }
 
 InstantController* LocationBarViewGtk::GetInstant() {
   return browser_->instant_controller()->instant();
 }
 
@@ skipping 1222 matching lines @@
 }
 
 void LocationBarViewGtk::PageActionViewGtk::InspectPopup(
     ExtensionAction* action) {
   ExtensionPopupGtk::Show(
       action->GetPopupUrl(current_tab_id_),
       owner_->browser_,
       event_box_.get(),
       ExtensionPopupGtk::SHOW_AND_INSPECT);
 }