Revert of Introduce GpuVideoDecodeAcceleratorFactory.

content/common/gpu/media/gpu_video_decode_accelerator_helpers.h

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CONTENT_COMMON_GPU_MEDIA_GPU_VIDEO_DECODE_ACCELERATOR_HELPERS_H_
-#define CONTENT_COMMON_GPU_MEDIA_GPU_VIDEO_DECODE_ACCELERATOR_HELPERS_H_
-
-#include "base/callback.h"
-#include "base/memory/weak_ptr.h"
-
-namespace gfx {
-class GLContext;
-}
-
-namespace gl {
-class GLImage;
-}
-
-namespace gpu {
-namespace gles2 {
-class GLES2Decoder;
-}
-}
-
-namespace content {
-
-// Helpers/defines for specific VideoDecodeAccelerator implementations in GPU
-// process. Which callbacks are required depends on the implementation.
-//
-// Note that these callbacks may be called more than once, and so must own/share
-// ownership of any objects bound to them.
-//
-// Unless specified otherwise, these callbacks must be executed on the GPU Child
-// thread (i.e. the thread which the VDAs are initialized on).
-
-// Return current GLContext.
-using GetGLContextCallback = base::Callback<gfx::GLContext*(void)>;
-
-// Make the applicable GL context current. To be called by VDAs before
-// executing any GL calls. Return true on success, false otherwise.
-using MakeGLContextCurrentCallback = base::Callback<bool(void)>;
-
-// Bind |image| to |client_texture_id| given |texture_target|. If
-// |can_bind_to_sampler| is true, then the image may be used as a sampler
-// directly, otherwise a copy to a staging buffer is required.
-// Return true on success, false otherwise.
-using BindGLImageCallback =
-    base::Callback<bool(uint32_t client_texture_id,
-                        uint32_t texture_target,
-                        const scoped_refptr<gl::GLImage>& image,
-                        bool can_bind_to_sampler)>;
-
-// Return a WeakPtr to a GLES2Decoder, if one is available.
-using GetGLES2DecoderCallback =
-    base::Callback<base::WeakPtr<gpu::gles2::GLES2Decoder>(void)>;
-
-}  // namespace content
-
-#endif  // CONTENT_COMMON_GPU_MEDIA_GPU_VIDEO_DECODE_ACCELERATOR_HELPERS_H_