Previews infobar tests

chrome/browser/previews/previews_infobar_tab_helper.cc

 // Copyright 2016 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/previews/previews_infobar_tab_helper.h"
 
 #include "chrome/browser/previews/previews_infobar_delegate.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_headers.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/common/referrer.h"
 #include "net/http/http_response_headers.h"
 #include "url/gurl.h"
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(PreviewsInfoBarTabHelper);
 
 PreviewsInfoBarTabHelper::~PreviewsInfoBarTabHelper() {}
 
 PreviewsInfoBarTabHelper::PreviewsInfoBarTabHelper(
     content::WebContents* web_contents)
     : content::WebContentsObserver(web_contents),
@@ skipping 18 matching lines @@
       navigation_handle->GetResponseHeaders();
   if (headers &&
       headers->HasHeaderValue(
           data_reduction_proxy::chrome_proxy_header(),
           data_reduction_proxy::chrome_proxy_lo_fi_preview_directive())) {
     PreviewsInfoBarDelegate::Create(navigation_handle->GetWebContents(),
                                     PreviewsInfoBarDelegate::LITE_PAGE);
   }
 }