Move PathIsWritable, DirectoryExists, ContentsEqual, and TextContentsEqual to the base namespace.

chrome_frame/test/test_with_web_server.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 "chrome_frame/test/test_with_web_server.h"
 
 #include "base/base_paths.h"
 #include "base/file_util.h"
 #include "base/file_version_info.h"
 #include "base/files/memory_mapped_file.h"
@@ skipping 382 matching lines @@
   if (query_index != std::string::npos) {
     path = path.erase(query_index);
   }
   base::FilePath file_path = root_dir_;
   if (path.size())
     file_path = file_path.Append(path.substr(1));  // remove first '/'
 
   std::string headers, body;
   std::string content_type;
   if (base::PathExists(file_path) &&
-      !file_util::DirectoryExists(file_path)) {
+      !base::DirectoryExists(file_path)) {
     base::FilePath mock_http_headers(file_path.value() + L".mock-http-headers");
     if (base::PathExists(mock_http_headers)) {
       headers = GetMockHttpHeaders(mock_http_headers);
       content_type = http_utils::GetHttpHeaderFromHeaderList("Content-type",
                                                              headers);
     } else {
       EXPECT_TRUE(net::GetMimeTypeFromFile(file_path, &content_type));
       VLOG(1) << "Going to send file (" << WideToUTF8(file_path.value())
               << ") with content type (" << content_type << ")";
       headers = CreateHttpHeaders(invocation, add_no_cache_header,
@@ skipping 676 matching lines @@
 // This test loads a large page and ensures that the full page contents are
 // actually loaded via a self-validating HTML page. This is done due to a bug
 // whereby the middle of the response stream would sometimes be truncated when
 // loading a CF document. See http://crbug.com/178421 for details.
 TEST_F(ChromeFrameTestWithWebServer, FullTabModeIE_LargePageLoad) {
   const wchar_t kLargePageLoadPage[] =
       L"chrome_frame_large_page.html";
 
   SimpleBrowserTest(IE, kLargePageLoadPage);
 }