Clean up some unused code

Bug: dawn:2343
Change-Id: I7e1bdff72c4d37fd4ae2bd14374f4dfd9c11f73f
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/194740
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
diff --git a/src/dawn/native/Device.h b/src/dawn/native/Device.h
index 3a9189f..f8288c5 100644
--- a/src/dawn/native/Device.h
+++ b/src/dawn/native/Device.h
@@ -414,21 +414,6 @@
     CallbackTaskManager* GetCallbackTaskManager() const;
     dawn::platform::WorkerTaskPool* GetWorkerTaskPool() const;
 
-    // Enqueue a successfully-create async pipeline creation callback.
-    // TODO(dawn:2353): Remove.
-    void AddRenderPipelineAsyncCallbackTask(Ref<RenderPipelineBase> pipeline,
-                                            WGPUCreateRenderPipelineAsyncCallback callback,
-                                            void* userdata);
-    // Enqueue a failed async pipeline creation callback.
-    // If the device is lost, then further errors should not be reported to
-    // the application. Instead of an error, a successful callback is enqueued, using
-    // an error pipeline created with `label`.
-    // TODO(dawn:2353): Remove.
-    void AddRenderPipelineAsyncCallbackTask(std::unique_ptr<ErrorData> error,
-                                            const char* label,
-                                            WGPUCreateRenderPipelineAsyncCallback callback,
-                                            void* userdata);
-
     PipelineCompatibilityToken GetNextPipelineCompatibilityToken();
 
     const CacheKey& GetCacheKey() const;