Move Extension into extensions namespace

chrome/browser/download/download_browsertest.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 <sstream>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
@@ skipping 51 matching lines @@
 #include "net/base/net_util.h"
 #include "net/test/test_server.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using content::BrowserThread;
 using content::DownloadItem;
 using content::DownloadManager;
 using content::DownloadPersistentStoreInfo;
 using content::DownloadUrlParameters;
 using content::WebContents;
+using extensions::Extension;
 
 namespace {
 
 // IDs and paths of CRX files used in tests.
 const char kGoodCrxId[] = "ldnnhddmnhbkjipkidpdiheffobcpfmf";
 const FilePath kGoodCrxPath(FILE_PATH_LITERAL("extensions/good.crx"));
 
 const char kLargeThemeCrxId[] = "pjpgmfcmabopnnfonnhmdjglfpjjfkbf";
 const FilePath kLargeThemePath(FILE_PATH_LITERAL("extensions/theme2.crx"));
 
@@ skipping 2361 matching lines @@
   GetDownloads(browser(), &download_items);
   ASSERT_EQ(1u, download_items.size());
   ASSERT_EQ(test_server()->GetURL("echoheader?Referer"),
             download_items[0]->GetOriginalUrl());
 
   // Check that the file contains the expected referrer.
   FilePath file(download_items[0]->GetFullPath());
   std::string expected_contents = test_server()->GetURL("").spec();
   ASSERT_TRUE(VerifyFile(file, expected_contents, expected_contents.length()));
 }