Fix crash when a page action cannot load its icon.

chrome/browser/views/location_bar_view.cc

 // Copyright (c) 2009 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/views/location_bar_view.h"
 
 #if defined(OS_LINUX)
 #include <gtk/gtk.h>
 #endif
 
@@ skipping 1296 matching lines @@
 
 void LocationBarView::PageActionImageView::ShowInfoBubble() {
   ShowInfoBubbleImpl(ASCIIToWide(tooltip_), GetColor(false, TEXT));
 }
 
 void LocationBarView::PageActionImageView::OnImageLoaded(SkBitmap* image,
                                                          size_t index) {
   DCHECK(index < page_action_icons_.size());
   if (index == page_action_icons_.size() - 1)
     tracker_ = NULL;  // The tracker object will delete itself when we return.
-  page_action_icons_[index] = *image;
+  if (image)
+    page_action_icons_[index] = *image;
   owner_->UpdatePageActions();
 }
 
 void LocationBarView::PageActionImageView::UpdateVisibility(
     TabContents* contents, const GURL& url) {
   // Save this off so we can pass it back to the extension when the action gets
   // executed. See PageActionImageView::OnMousePressed.
   current_tab_id_ = ExtensionTabUtil::GetTabId(contents);
   current_url_ = url;
 
@@ skipping 70 matching lines @@
 }
 
 int LocationBarView::PageActionVisibleCount() {
   int result = 0;
   for (size_t i = 0; i < page_action_views_.size(); i++) {
     if (page_action_views_[i]->IsVisible())
       ++result;
   }
   return result;
 }