crbug.com/124865 - DCHECK failure when pinning Chrome Web Store to Launcher

chrome/browser/extensions/image_loading_tracker.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/extensions/image_loading_tracker.h"
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 293 matching lines @@
   PendingLoadInfo* info = &load_map_it->second;
 
   // Save the pending results.
   DCHECK(info->pending_count > 0);
   info->pending_count--;
   if (image)
     info->bitmaps.push_back(*image);
 
   // Add to the extension's image cache if requested.
   DCHECK(info->cache != CACHE || info->extension);
-  if (should_cache && info->cache == CACHE  &&
+  if (should_cache && info->cache == CACHE && !resource.empty() &&
       !info->extension->HasCachedImage(resource, original_size)) {
     info->extension->SetCachedImage(resource, image ? *image : SkBitmap(),
                                     original_size);
   }
 
   // If all pending images are done then report back.
   if (info->pending_count == 0) {
     gfx::Image image;
     std::string extension_id = info->extension_id;
 
@@ skipping 27 matching lines @@
   // Remove reference to this extension from all pending load entries. This
   // ensures we don't attempt to cache the image when the load completes.
   for (LoadMap::iterator i = load_map_.begin(); i != load_map_.end(); ++i) {
     PendingLoadInfo* info = &i->second;
     if (info->extension == extension) {
       info->extension = NULL;
       info->cache = DONT_CACHE;
     }
   }
 }