Properly protect state variable by locking

content/common/gpu/media/vaapi_video_decode_accelerator.cc

Index: content/common/gpu/media/vaapi_video_decode_accelerator.cc
diff --git a/content/common/gpu/media/vaapi_video_decode_accelerator.cc b/content/common/gpu/media/vaapi_video_decode_accelerator.cc
index 50a6a6719a58dcda267b7deb6d0376a463ae71d0..6b8e8791d9b709c65fa9f2015fb3f5a7b78be020 100644
--- a/content/common/gpu/media/vaapi_video_decode_accelerator.cc
+++ b/content/common/gpu/media/vaapi_video_decode_accelerator.cc
@@ -715,11 +715,11 @@ void VaapiVideoDecodeAccelerator::FinishReset() {
 void VaapiVideoDecodeAccelerator::Cleanup() {
   DCHECK_EQ(message_loop_, base::MessageLoop::current());
 
+  base::AutoLock auto_lock(lock_);
   if (state_ == kUninitialized || state_ == kDestroying)
     return;
 
   DVLOG(1) << "Destroying VAVDA";
-  base::AutoLock auto_lock(lock_);
   state_ = kDestroying;
 
   client_ptr_factory_.reset();