Changes to default apps promo per ui leads:

chrome/browser/dom_ui/new_tab_ui.cc

 // Copyright (c) 2010 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 "build/build_config.h"
 
 #include "chrome/browser/dom_ui/new_tab_ui.h"
 
 #include <set>
 
@@ skipping 587 matching lines @@
 NewTabUI::NewTabHTMLSource::NewTabHTMLSource(Profile* profile)
     : DataSource(chrome::kChromeUINewTabHost, MessageLoop::current()),
       profile_(profile) {
 }
 
 void NewTabUI::NewTabHTMLSource::StartDataRequest(const std::string& path,
                                                   bool is_off_the_record,
                                                   int request_id) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
-  if (AppLauncherHandler::HandlePing(path)) {
+  if (AppLauncherHandler::HandlePing(profile_, path)) {
     return;
   } else if (!path.empty() && path[0] != '#') {
     // A path under new-tab was requested; it's likely a bad relative
     // URL from the new tab page, but in any case it's an error.
     NOTREACHED();
     return;
   }
 
   scoped_refptr<RefCountedBytes> html_bytes(
       profile_->GetNTPResourceCache()->GetNewTabHTML(is_off_the_record));
 
   SendResponse(request_id, html_bytes);
 }
 
 std::string NewTabUI::NewTabHTMLSource::GetMimeType(const std::string&) const {
   return "text/html";
 }