VDA unittest: fix ~GLRenderingVDAClient crash in debug build.

media/gpu/video_decode_accelerator_unittest.cc

Index: media/gpu/video_decode_accelerator_unittest.cc
diff --git a/media/gpu/video_decode_accelerator_unittest.cc b/media/gpu/video_decode_accelerator_unittest.cc
index 365859f06397bc8f15358b8a43d31bf95d7a0163..198176912361c0b9015914dd72ab9b075ca2cb9a 100644
--- a/media/gpu/video_decode_accelerator_unittest.cc
+++ b/media/gpu/video_decode_accelerator_unittest.cc
@@ -1493,16 +1493,17 @@ TEST_P(VideoDecodeAcceleratorParamTest, TestSimpleDecode) {
     }
   }
 
-  std::unique_ptr<NotesVector> notes2(new NotesVector);
-  notes2->swap(notes);
   std::unique_ptr<ClientsVector> clients2(new ClientsVector);
   clients2->swap(clients);
+  std::unique_ptr<NotesVector> notes2(new NotesVector);
+  notes2->swap(notes);
 
+  // |clients| must be deleted first because |clients| use |notes2|.
   g_env->GetRenderingTaskRunner()->PostTask(
-      FROM_HERE, base::Bind(&Delete<NotesVector>, base::Passed(&notes2)));
+      FROM_HERE, base::Bind(&Delete<ClientsVector>, base::Passed(&clients2)));
 
   g_env->GetRenderingTaskRunner()->PostTask(
-      FROM_HERE, base::Bind(&Delete<ClientsVector>, base::Passed(&clients2)));
+      FROM_HERE, base::Bind(&Delete<NotesVector>, base::Passed(&notes2)));
 
   WaitUntilIdle();
 };