Move WriteFile and WriteFileDescriptor from file_util to base namespace.

components/browser_context_keyed_service/browser_context_dependency_manager.cc

 // Copyright (c) 2013 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 "components/browser_context_keyed_service/browser_context_dependency_manager.h"
 
 #include <algorithm>
 #include <deque>
 #include <iterator>
 
@@ skipping 156 matching lines @@
     content::BrowserContext* context) {
   // Whenever we try to build a destruction ordering, we should also dump a
   // dependency graph to "/path/to/context/context-dependencies.dot".
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           kDumpBrowserContextDependencyGraphFlag)) {
     base::FilePath dot_file =
         context->GetPath().AppendASCII("browser-context-dependencies.dot");
     std::string contents = dependency_graph_.DumpAsGraphviz(
         "BrowserContext",
         base::Bind(&BrowserContextKeyedBaseFactoryGetNodeName));
-    file_util::WriteFile(dot_file, contents.c_str(), contents.size());
+    base::WriteFile(dot_file, contents.c_str(), contents.size());
   }
 }
 #endif  // NDEBUG