[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 a0ab15d6004c9ab13fdf45fdd9e397a7791c177f..4aa9595d23a28def0d4b2c0c79abd3ccda9ec6d3 100644
--- a/webkit/browser/fileapi/sandbox_file_system_backend.cc
+++ b/webkit/browser/fileapi/sandbox_file_system_backend.cc
@@ -85,6 +85,11 @@ AsyncFileUtil* SandboxFileSystemBackend::GetAsyncFileUtil(
   return delegate_->file_util();
 }
 
+WatcherManager* SandboxFileSystemBackend::GetWatcherManager(
+    FileSystemType type) {
+  return NULL;
+}
+
 CopyOrMoveFileValidatorFactory*
 SandboxFileSystemBackend::GetCopyOrMoveFileValidatorFactory(
     FileSystemType type,