Bug 1650214 - Cancel progress timer when shutting down FileReader

Not canceling the timer when run in a worker could lead to the timer firing
after the primary worker runnable finished running, leading to an assertion
failure in cycle collector code.

1 files changed, 1 insertions, 0 deletions

diff --git a/dom/base/FileReader.cpp b/dom/base/FileReader.cpp
index 273e192d0c..7a8cb31d6e 100644
--- a/dom/base/FileReader.cpp
+++ b/dom/base/FileReader.cpp
@@ -775,6 +775,7 @@ FileReader::Shutdown()
     mAsyncStream = nullptr;
   }
 
+  ClearProgressEventTimer();
   FreeFileData();
   mResultArrayBuffer = nullptr;