Get signals working in the EXTRA_DATA section of MHTML

chrome/browser/android/offline_pages/offline_page_mhtml_archiver_unittest.cc

 // Copyright 2015 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/android/offline_pages/offline_page_mhtml_archiver.h"
 
 #include <stdint.h>
 
 #include <memory>
 
@@ skipping 136 matching lines @@
 }
 
 OfflinePageMHTMLArchiverTest::~OfflinePageMHTMLArchiverTest() {
 }
 
 std::unique_ptr<TestMHTMLArchiver> OfflinePageMHTMLArchiverTest::CreateArchive(
     const GURL& url,
     TestMHTMLArchiver::TestScenario scenario) {
   std::unique_ptr<TestMHTMLArchiver> archiver(
       new TestMHTMLArchiver(url, scenario));
+  std::string extra_data;
   archiver->CreateArchive(GetTestFilePath(),
                           OfflinePageArchiver::CreateArchiveParams(),
-                          callback());
+                          extra_data, callback());
   PumpLoop();
   return archiver;
 }
 
 void OfflinePageMHTMLArchiverTest::OnCreateArchiveDone(
     OfflinePageArchiver* archiver,
     OfflinePageArchiver::ArchiverResult result,
     const GURL& url,
     const base::FilePath& file_path,
     const base::string16& title,
@@ skipping 55 matching lines @@
   PumpLoop();
 
   EXPECT_EQ(archiver.get(), last_archiver());
   EXPECT_EQ(OfflinePageArchiver::ArchiverResult::SUCCESSFULLY_CREATED,
             last_result());
   EXPECT_EQ(GetTestFilePath(), last_file_path());
   EXPECT_EQ(kTestFileSize, last_file_size());
 }
 
 }  // namespace offline_pages