Revert of Update ozone/drm proxy_helpers.h to support move-only types.

ui/ozone/platform/drm/gpu/proxy_helpers.h

Index: ui/ozone/platform/drm/gpu/proxy_helpers.h
diff --git a/ui/ozone/platform/drm/gpu/proxy_helpers.h b/ui/ozone/platform/drm/gpu/proxy_helpers.h
index 086709c9a01b36fbb9347a88424983064e7e2130..0cd73b785ea9f97b65ee60e5367586c309ad196d 100644
--- a/ui/ozone/platform/drm/gpu/proxy_helpers.h
+++ b/ui/ozone/platform/drm/gpu/proxy_helpers.h
@@ -22,15 +22,6 @@
   task_runner->PostTask(FROM_HERE, base::Bind(callback, args...));
 }
 
-template <typename... Args>
-void PostAsyncTaskOnce(
-    const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
-    base::OnceCallback<void(Args...)> callback,
-    Args... args) {
-  auto closure = base::BindOnce(std::move(callback), std::move(args)...);
-  task_runner->PostTask(FROM_HERE, std::move(closure));
-}
-
 }  // namespace internal
 
 // Posts a task to a different thread and blocks waiting for the task to finish
@@ -49,17 +40,6 @@
                     base::ThreadTaskRunnerHandle::Get(), callback);
 }
 
-// Creates a OnceCallback that will run |callback| on the calling thread. Useful
-// when posting a task on a different thread and expecting a callback when the
-// task finished (and the callback needs to run on the original thread).
-template <typename... Args>
-base::OnceCallback<void(Args...)> CreateSafeOnceCallback(
-    base::OnceCallback<void(Args...)> callback) {
-  return base::BindOnce(&internal::PostAsyncTaskOnce<Args...>,
-                        base::ThreadTaskRunnerHandle::Get(),
-                        std::move(callback));
-}
-
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_GPU_PROXY_HELPERS_H_