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

chrome/browser/extensions/api/webstore_private/webstore_private_apitest.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 <vector>
 
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 180 matching lines @@
   base::ScopedTempDir temp_dir;
   EXPECT_TRUE(temp_dir.CreateUniqueTempDir());
   base::FilePath missing_directory = temp_dir.Take();
   EXPECT_TRUE(base::Delete(missing_directory, true));
   WebstoreInstaller::SetDownloadDirectoryForTests(&missing_directory);
 
   // Now run the install test, which should succeed.
   ASSERT_TRUE(RunInstallTest("accepted.html", "extension.crx"));
 
   // Cleanup.
-  if (file_util::DirectoryExists(missing_directory))
+  if (base::DirectoryExists(missing_directory))
     EXPECT_TRUE(base::Delete(missing_directory, true));
 }
 
 // Tests passing a localized name.
 IN_PROC_BROWSER_TEST_F(ExtensionWebstorePrivateApiTest, InstallLocalized) {
   ASSERT_TRUE(RunInstallTest("localized.html", "localized_extension.crx"));
 }
 
 // Now test the case where the user cancels the confirmation dialog.
 IN_PROC_BROWSER_TEST_F(ExtensionWebstorePrivateApiTest, InstallCancelled) {
@@ skipping 154 matching lines @@
   content::GpuDataManager::GetInstance()->InitializeForTesting(
       json_blacklist, gpu_info);
   EXPECT_TRUE(content::GpuDataManager::GetInstance()->IsFeatureBlacklisted(
       gpu::GPU_FEATURE_TYPE_WEBGL));
 
   bool webgl_allowed = false;
   RunTest(webgl_allowed);
 }
 
 }  // namespace extensions