Revert of ui: Add GLImage unit test framework.

ui/gl/test/gl_image_test_support.h

-// Copyright 2015 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 UI_GL_TEST_GL_IMAGE_TEST_SUPPORT_H_
-#define UI_GL_TEST_GL_IMAGE_TEST_SUPPORT_H_
-
-#include "ui/gfx/buffer_types.h"
-#include "ui/gl/gl_bindings.h"
-
-namespace gfx {
-
-class GLImageTestSupport {
- public:
-  // Initialize GL for image testing.
-  static void InitializeGL();
-
-  // Cleanup GL after being initialized for image testing.
-  static void CleanupGL();
-
-  // Returns the preferred internal format used for images.
-  static GLenum GetPreferredInternalFormat();
-
-  // Returns the preferred buffer format used for images.
-  static BufferFormat GetPreferredBufferFormat();
-
-  // Initialize buffer of a specific |format| to |color|.
-  static void SetBufferDataToColor(int width,
-                                   int height,
-                                   int stride,
-                                   BufferFormat format,
-                                   const uint8_t color[4],
-                                   uint8_t* data);
-};
-
-}  // namespace gfx
-
-#endif  // UI_GL_TEST_GL_IMAGE_TEST_SUPPORT_H_