Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/installer/setup/install.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/installer/setup/install.h"
 
 #include <windows.h>
 #include <shlobj.h>
 #include <time.h>
 
@@ skipping 334 matching lines @@
     base::string16 display_name(dist->GetDisplayName());
     EscapeXmlAttributeValueInSingleQuotes(&display_name);
 
     // Fill the manifest with the desired values.
     base::string16 manifest16(base::StringPrintf(
         manifest_template.c_str(), display_name.c_str(), elements_dir.c_str()));
 
     // Write the manifest to |src_path|.
     const std::string manifest(UTF16ToUTF8(manifest16));
     int size = base::checked_cast<int>(manifest.size());
-    if (file_util::WriteFile(
+    if (base::WriteFile(
         src_path.Append(installer::kVisualElementsManifest),
             manifest.c_str(), size) == size) {
       VLOG(1) << "Successfully wrote " << installer::kVisualElementsManifest
               << " to " << src_path.value();
       return true;
     } else {
       PLOG(ERROR) << "Error writing " << installer::kVisualElementsManifest
                   << " to " << src_path.value();
       return false;
     }
@@ skipping 336 matching lines @@
   if (app_host_path.empty())
     return false;
 
   CommandLine cmd(app_host_path);
   cmd.AppendSwitchASCII(::switches::kInstallFromWebstore, app_code);
   VLOG(1) << "App install command: " << cmd.GetCommandLineString();
   return base::LaunchProcess(cmd, base::LaunchOptions(), NULL);
 }
 
 }  // namespace installer