Clear data for origin if no files found

content/browser/plugin_private_storage_helper.cc

Index: content/browser/plugin_private_storage_helper.cc
diff --git a/content/browser/plugin_private_storage_helper.cc b/content/browser/plugin_private_storage_helper.cc
index 86278c0409ea125a5529b411140f7d3017e2c5c1..a84f6580daa4dc56a1bca862d8742ee1afe93e8c 100644
--- a/content/browser/plugin_private_storage_helper.cc
+++ b/content/browser/plugin_private_storage_helper.cc
@@ -112,6 +112,9 @@ class PluginPrivateDataByOriginChecker {
   // Keep track if the data for this origin needs to be deleted due to
   // any file found that has last modified time between |begin_| and |end_|.
   bool delete_this_origin_data_ = false;
+
+  // Keep track if any files exist for this origin.
+  bool files_found_ = false;
 };
 
 void PluginPrivateDataByOriginChecker::CheckFilesOnIOThread() {
@@ -168,6 +171,10 @@ void PluginPrivateDataByOriginChecker::OnDirectoryRead(
     return;
   }
 
+  // If there are files found, keep track of it.
+  if (!file_list.empty())
+    files_found_ = true;
+
   // No error, process the files returned. No need to do this if we have
   // already decided to delete all the data for this origin.
   if (!delete_this_origin_data_) {
@@ -228,6 +235,10 @@ void PluginPrivateDataByOriginChecker::DecrementTaskCount() {
   if (task_count_)
     return;
 
+  // If no files exist for this origin, then we can safely delete it.
+  if (!files_found_)
+    delete_this_origin_data_ = true;
+
   // If there are no more tasks in progress, then run |callback_| on the
   // proper thread.
   filesystem_context_->default_file_task_runner()->PostTask(