Work-around fix for SyncFS file upload

chrome/browser/sync_file_system/drive_backend/api_util.cc

Index: chrome/browser/sync_file_system/drive_backend/api_util.cc
diff --git a/chrome/browser/sync_file_system/drive_backend/api_util.cc b/chrome/browser/sync_file_system/drive_backend/api_util.cc
index 6d6013d635b1fc880ee84c845a558d2c943fd420..6f2a0b5e0fb3bb7a78538d48225ea9706bc65c0a 100644
--- a/chrome/browser/sync_file_system/drive_backend/api_util.cc
+++ b/chrome/browser/sync_file_system/drive_backend/api_util.cc
@@ -903,7 +903,8 @@ void APIUtil::UploadExistingFileInternal(
       entry->resource_id(),
       local_file_path,
       mime_type,
-      entry->etag(),
+      // Don't use etag for uploading for now. http://crbug.com/278201
+      std::string(), // entry->etag(),
       base::Bind(&UploadResultAdapter, did_upload_callback),
       google_apis::ProgressCallback());
 }