[ew] Add basic classes.

webkit/browser/fileapi/sandbox_file_system_backend.cc

Index: webkit/browser/fileapi/sandbox_file_system_backend.cc
diff --git a/webkit/browser/fileapi/sandbox_file_system_backend.cc b/webkit/browser/fileapi/sandbox_file_system_backend.cc
index cb288aaab910e40eefbe15c1ac4419663afa14a0..19e94f2a8e718634aec512044b76ebf6e0d3443c 100644
--- a/webkit/browser/fileapi/sandbox_file_system_backend.cc
+++ b/webkit/browser/fileapi/sandbox_file_system_backend.cc
@@ -87,6 +87,11 @@ AsyncFileUtil* SandboxFileSystemBackend::GetAsyncFileUtil(
   return delegate_->file_util();
 }
 
+WatcherManager* SandboxFileSystemBackend::GetWatcherManager(
+    FileSystemType type) {
+  return NULL;
+}
+
 CopyOrMoveFileValidatorFactory*
 SandboxFileSystemBackend::GetCopyOrMoveFileValidatorFactory(
     FileSystemType type,