[ew] Add basic classes.

webkit/browser/fileapi/plugin_private_file_system_backend.cc

Index: webkit/browser/fileapi/plugin_private_file_system_backend.cc
diff --git a/webkit/browser/fileapi/plugin_private_file_system_backend.cc b/webkit/browser/fileapi/plugin_private_file_system_backend.cc
index 7beb1b7f6ea22344a23a1b7bafe474a9ac668acd..0a3cbf9413d8a10600ec9934a8991448d8d03d1e 100644
--- a/webkit/browser/fileapi/plugin_private_file_system_backend.cc
+++ b/webkit/browser/fileapi/plugin_private_file_system_backend.cc
@@ -160,6 +160,11 @@ PluginPrivateFileSystemBackend::GetAsyncFileUtil(FileSystemType type) {
   return file_util_.get();
 }
 
+WatcherManager* PluginPrivateFileSystemBackend::GetWatcherManager(
+    FileSystemType type) {
+  return NULL;
+}
+
 CopyOrMoveFileValidatorFactory*
 PluginPrivateFileSystemBackend::GetCopyOrMoveFileValidatorFactory(
     FileSystemType type,