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

chrome/browser/extensions/webstore_installer.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/browser/extensions/webstore_installer.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
@@ skipping 70 matching lines @@
                      *g_download_directory_for_tests : download_directory);
 
 #if defined(OS_CHROMEOS)
   // Do not use drive for extension downloads.
   if (drive::util::IsUnderDriveMountPoint(directory))
     directory = download_util::GetDefaultDownloadDirectory();
 #endif
 
   // Ensure the download directory exists. TODO(asargent) - make this use
   // common code from the downloads system.
-  if (!file_util::DirectoryExists(directory)) {
+  if (!base::DirectoryExists(directory)) {
     if (!file_util::CreateDirectory(directory)) {
       BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
                               base::Bind(callback, base::FilePath()));
       return;
     }
   }
 
   // This is to help avoid a race condition between when we generate this
   // filename and when the download starts writing to it (think concurrently
   // running sharded browser tests installing the same test file, for
@@ skipping 357 matching lines @@
 void WebstoreInstaller::ReportSuccess() {
   if (delegate_) {
     delegate_->OnExtensionInstallSuccess(id_);
     delegate_ = NULL;
   }
 
   Release();  // Balanced in Start().
 }
 
 }  // namespace extensions