Remove flip_y, premultiply_alpha, unmultiply_alpha support in command buffer.

gpu/command_buffer/client/gles2_implementation.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.
 
 #ifndef GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_H_
 #define GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_H_
 
 #include <GLES2/gl2.h>
 
 #include <list>
@@ skipping 678 matching lines @@
 
   GLStaticState static_state_;
   ClientContextState state_;
 
   // pack alignment as last set by glPixelStorei
   GLint pack_alignment_;
 
   // unpack alignment as last set by glPixelStorei
   GLint unpack_alignment_;
 
-  // unpack yflip as last set by glPixelstorei
-  bool unpack_flip_y_;
-
   // unpack row length as last set by glPixelStorei
   GLint unpack_row_length_;
 
   // unpack image height as last set by glPixelStorei
   GLint unpack_image_height_;
 
   // unpack skip rows as last set by glPixelStorei
   GLint unpack_skip_rows_;
 
   // unpack skip pixels as last set by glPixelStorei
@@ skipping 141 matching lines @@
 
 inline bool GLES2Implementation::GetTexParameterivHelper(
     GLenum /* target */, GLenum /* pname */, GLint* /* params */) {
   return false;
 }
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_H_