Count number of origins with data affected by clearing "cookies and site data".

storage/browser/fileapi/file_system_quota_client.cc

Index: storage/browser/fileapi/file_system_quota_client.cc
diff --git a/storage/browser/fileapi/file_system_quota_client.cc b/storage/browser/fileapi/file_system_quota_client.cc
index 26fde452d6a8f0b931157158a1799a5d2aab872e..dfb32ef34aa9148666968764d5769138c9837a1b 100644
--- a/storage/browser/fileapi/file_system_quota_client.cc
+++ b/storage/browser/fileapi/file_system_quota_client.cc
@@ -167,9 +167,13 @@ void FileSystemQuotaClient::DeleteOriginData(
     const GURL& origin,
     StorageType type,
     const DeletionCallback& callback) {
+  // TODO? This method only deletes filesytem entries associated with a quota

[msramek, 2017/01/09 12:54:44]

Let's ask FS owners about this.

[dullweber, 2017/01/09 16:05:46]

I created http://crbug.com/679362 for it. 

+  // type but there are much more kinds of filesystems, which don't get deleted?
+  // Maybe use FileSystemContext::DeleteDataForOriginOnFileTaskRunner, which
+  // iterates over all backends?
   FileSystemType fs_type = QuotaStorageTypeToFileSystemType(type);
   DCHECK(fs_type != kFileSystemTypeUnknown);
-
+  LOG(ERROR) << "deleting filesystem entry: " << origin.spec();
   base::PostTaskAndReplyWithResult(
       file_task_runner(), FROM_HERE,
       base::Bind(&DeleteOriginOnFileTaskRunner,