Abort SandboxedUnpacker::RewriteImageFiles on browser shutdown

base/threading/sequenced_worker_pool.cc

Index: base/threading/sequenced_worker_pool.cc
diff --git a/base/threading/sequenced_worker_pool.cc b/base/threading/sequenced_worker_pool.cc
index f98b23d5d6168a818178fe0c2e0a777edd618bd5..b97c5300f61c2334691ba1d9d32073235b19e9ca 100644
--- a/base/threading/sequenced_worker_pool.cc
+++ b/base/threading/sequenced_worker_pool.cc
@@ -289,6 +289,8 @@ class SequencedWorkerPool::Inner {
 
   void Shutdown(int max_blocking_tasks_after_shutdown);
 
+  bool IsShutdownInProgress();
+
   // Runs the worker loop on the background thread.
   void ThreadLoop(Worker* this_worker);
 
@@ -678,6 +680,11 @@ void SequencedWorkerPool::Inner::Shutdown(
                       TimeTicks::Now() - shutdown_wait_begin);
 }
 
+bool SequencedWorkerPool::Inner::IsShutdownInProgress() {
+    AutoLock lock(lock_);
+    return shutdown_called_;
+}
+
 void SequencedWorkerPool::Inner::ThreadLoop(Worker* this_worker) {
   {
     AutoLock lock(lock_);
@@ -1236,4 +1243,8 @@ void SequencedWorkerPool::Shutdown(int max_new_blocking_tasks_after_shutdown) {
   inner_->Shutdown(max_new_blocking_tasks_after_shutdown);
 }
 
+bool SequencedWorkerPool::IsShutdownInProgress() {
+  return inner_->IsShutdownInProgress();
+}
+
 }  // namespace base