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

base/files/file_path_watcher_win.cc

Index: base/files/file_path_watcher_win.cc
diff --git a/base/files/file_path_watcher_win.cc b/base/files/file_path_watcher_win.cc
index 823d74d2193a037d877049c36a54340e6186429f..ac092a931b9b926dc50d3a06475988f42e32f388 100644
--- a/base/files/file_path_watcher_win.cc
+++ b/base/files/file_path_watcher_win.cc
@@ -200,7 +200,7 @@ bool FilePathWatcherImpl::SetupWatchHandle(const FilePath& dir,
     // Make sure the handle we got points to an existing directory. It seems
     // that windows sometimes hands out watches to directories that are
     // about to go away, but doesn't sent notifications if that happens.
-    if (!file_util::DirectoryExists(dir)) {
+    if (!DirectoryExists(dir)) {
       FindCloseChangeNotification(*handle);
       *handle = INVALID_HANDLE_VALUE;
     }