Revert 132934 - this change seems to break many webgl related layout tests

gpu/command_buffer/service/gl_utils.h

 // Copyright (c) 2012 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.
 
 // This file includes all the necessary GL headers and implements some useful
 // utilities.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GL_UTILS_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GL_UTILS_H_
 
@@ skipping 24 matching lines @@
 
 // GL_OES_EGL_image_external
 #define GL_TEXTURE_EXTERNAL_OES                0x8D65
 #define GL_SAMPLER_EXTERNAL_OES                0x8D66
 #define GL_TEXTURE_BINDING_EXTERNAL_OES        0x8D67
 #define GL_REQUIRED_TEXTURE_IMAGE_UNITS_OES    0x8D68
 
 // GL_ANGLE_translated_shader_source
 #define GL_TRANSLATED_SHADER_SOURCE_LENGTH_ANGLE 0x93A0
 
-// GL_CHROMIUM_flipy
-#define GL_UNPACK_FLIP_Y_CHROMIUM             0x9240
-
-#define GL_UNPACK_PREMULTIPLY_ALPHA_CHROMIUM     0x9241
-#define GL_UNPACK_COLORSPACE_CONVERSION_CHROMIUM 0x9243
-
 // GL_ANGLE_pack_reverse_row_order
 #define GL_PACK_REVERSE_ROW_ORDER_ANGLE    0x93A4
 
 // GL_ANGLE_texture_usage
 #define GL_TEXTURE_USAGE_ANGLE                 0x93A2
 #define GL_FRAMEBUFFER_ATTACHMENT_ANGLE        0x93A3
 
 // GL_EXT_texture_storage
 #define GL_TEXTURE_IMMUTABLE_FORMAT_EXT        0x912F
 #define GL_ALPHA8_EXT                          0x803C
@@ skipping 32 matching lines @@
 #ifdef GL_ERROR_DEBUGGING
 #define CHECK_GL_ERROR() do {                                           \
     GLenum gl_error = glGetError();                                     \
     LOG_IF(ERROR, gl_error != GL_NO_ERROR) << "GL Error :" << gl_error; \
   } while (0)
 #else  // GL_ERROR_DEBUGGING
 #define CHECK_GL_ERROR() void(0)
 #endif  // GL_ERROR_DEBUGGING
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GL_UTILS_H_