Remove deprecated TabContentsDelegate::OpenURLFromTab variant

chrome/browser/chromeos/notifications/balloon_view.cc

 // Copyright (c) 2011 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/chromeos/notifications/balloon_view.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 220 matching lines @@
   notification_registrar_.Add(this,
     chrome::NOTIFICATION_NOTIFY_BALLOON_DISCONNECTED,
     content::Source<Balloon>(balloon));
 }
 
 void BalloonViewImpl::Update() {
   stale_ = false;
   if (!html_contents_->tab_contents())
     return;
   html_contents_->tab_contents()->controller().LoadURL(
-      balloon_->notification().content_url(), GURL(),
+      balloon_->notification().content_url(), content::Referrer(),
       content::PAGE_TRANSITION_LINK, std::string());
 }
 
 void BalloonViewImpl::Close(bool by_user) {
   closed_ = true;
   MessageLoop::current()->PostTask(
       FROM_HERE,
       base::Bind(&BalloonViewImpl::DelayedClose, AsWeakPtr(), by_user));
 }
 
@@ skipping 111 matching lines @@
 }
 
 gfx::NativeView BalloonViewImpl::GetParentNativeView() {
   RenderWidgetHostView* view =
       html_contents_->tab_contents()->render_view_host()->view();
   DCHECK(view);
   return view->GetNativeView();
 }
 
 }  // namespace chromeos