Move some more file utils to the base namespace.

chrome/browser/web_applications/web_app_win.cc

Index: chrome/browser/web_applications/web_app_win.cc
diff --git a/chrome/browser/web_applications/web_app_win.cc b/chrome/browser/web_applications/web_app_win.cc
index e4bb258a3272ea2efc44309777bd6ca908b43214..9c43e89b4b094051e51dfc7a0754f19ba4ebe59b 100644
--- a/chrome/browser/web_applications/web_app_win.cc
+++ b/chrome/browser/web_applications/web_app_win.cc
@@ -460,7 +460,7 @@ void DeletePlatformShortcuts(
   base::FilePath chrome_apps_dir;
   if (PathService::Get(base::DIR_START_MENU, &chrome_apps_dir)) {
     chrome_apps_dir = chrome_apps_dir.Append(GetAppShortcutsSubdirName());
-    if (file_util::IsDirectoryEmpty(chrome_apps_dir))
+    if (base::IsDirectoryEmpty(chrome_apps_dir))
       base::DeleteFile(chrome_apps_dir, false);
   }
 }
@@ -473,7 +473,7 @@ void DeleteAllShortcutsForProfile(const base::FilePath& profile_path) {
   base::FilePath chrome_apps_dir;
   if (PathService::Get(base::DIR_START_MENU, &chrome_apps_dir)) {
     chrome_apps_dir = chrome_apps_dir.Append(GetAppShortcutsSubdirName());
-    if (file_util::IsDirectoryEmpty(chrome_apps_dir))
+    if (base::IsDirectoryEmpty(chrome_apps_dir))
       base::DeleteFile(chrome_apps_dir, false);
   }
 }