Apps on NTP should be in order of installation

chrome/browser/extensions/extension_updater.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/extension_updater.h"
 
 #include <algorithm>
 #include <set>
 
 #include "base/bind.h"
@@ skipping 1017 matching lines @@
   DCHECK(alive_);
   NotifyStarted();
   ManifestFetchesBuilder fetches_builder(service_, extension_prefs_);
 
   // Add fetch records for extensions that should be fetched by an update URL.
   // These extensions are not yet installed.  They come from group policy
   // and external install sources.
   const PendingExtensionManager* pending_extension_manager =
       service_->pending_extension_manager();
 
-  std::set<std::string> pending_ids;
+  std::list<std::string> pending_ids;
   pending_extension_manager->GetPendingIdsForUpdateCheck(&pending_ids);
 
-  std::set<std::string>::const_iterator iter;
+  std::list<std::string>::const_iterator iter;
   for (iter = pending_ids.begin(); iter != pending_ids.end(); ++iter) {
     PendingExtensionInfo info;
     bool found_id = pending_extension_manager->GetById(*iter, &info);
     DCHECK(found_id);
     if (!found_id)
       continue;
 
     fetches_builder.AddPendingExtension(
         *iter,
         info.install_source(),
         info.update_url());
   }
 
   // Add fetch records for extensions that are installed and have an
   // update URL.
   const ExtensionSet* extensions = service_->extensions();
   for (ExtensionSet::const_iterator iter = extensions->begin();
        iter != extensions->end(); ++iter) {
     // An extension might be overwritten by policy, and have its update url
     // changed. Make sure existing extensions aren't fetched again, if a
     // pending fetch for an extension with the same id already exists.
-    if (!ContainsKey(pending_ids, (*iter)->id())) {
+    if (!pending_extension_manager->IsIdPending((*iter)->id())) {
       fetches_builder.AddExtension(**iter);
     }
   }
 
   fetches_builder.ReportStats();
 
   std::vector<ManifestFetchData*> fetches(fetches_builder.GetFetches());
 
   // Start a fetch of the blacklist if needed.
   if (blacklist_checks_enabled_) {
@@ skipping 225 matching lines @@
   std::set<std::string>::const_iterator i;
   for (i = ids.begin(); i != ids.end(); ++i)
     in_progress_ids_.insert(*i);
 }
 
 void ExtensionUpdater::RemoveFromInProgress(const std::set<std::string>& ids) {
   std::set<std::string>::const_iterator i;
   for (i = ids.begin(); i != ids.end(); ++i)
     in_progress_ids_.erase(*i);
 }