Move PathExists to base namespace.

chrome/browser/ui/app_list/app_list_service_mac.mm

 // Copyright 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 <ApplicationServices/ApplicationServices.h>
 #import <Cocoa/Cocoa.h>
 
 #include "apps/app_shim/app_shim_handler_mac.h"
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 160 matching lines @@
 }
 
 // Check that there is an app list shim. If enabling and there is not, make one.
 // If disabling with --enable-app-list-shim=0, and there is one, delete it.
 void CheckAppListShimOnFileThread(const base::FilePath& profile_path) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
   const bool enable =
       CommandLine::ForCurrentProcess()->HasSwitch(switches::kEnableAppListShim);
   base::FilePath install_path = web_app::GetAppInstallPath(
       GetAppListShortcutInfo(profile_path));
-  if (enable == file_util::PathExists(install_path))
+  if (enable == base::PathExists(install_path))
     return;
 
   if (enable) {
     content::BrowserThread::PostTask(
         content::BrowserThread::UI, FROM_HERE,
         base::Bind(&CreateAppListShim, profile_path));
     return;
   }
 
   // Sanity check because deleting things recursively is scary.
@@ skipping 266 matching lines @@
 
 // static
 AppListService* AppListService::Get() {
   return AppListServiceMac::GetInstance();
 }
 
 // static
 void AppListService::InitAll(Profile* initial_profile) {
   Get()->Init(initial_profile);
 }