Remove GenMailboxCHROMIUM command

gpu/command_buffer/common/gles2_cmd_format.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 defines the GLES2 command buffer commands.
 
 #ifndef GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_FORMAT_H_
 #define GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_FORMAT_H_
 
 
@@ skipping 292 matching lines @@
 
 static_assert(sizeof(UniformBlocksHeader) == 4,
               "size of UniformBlocksHeader should be 4");
 static_assert(offsetof(UniformBlocksHeader, num_uniform_blocks) == 0,
               "offset of UniformBlocksHeader.num_uniform_blocks should be 0");
 
 namespace cmds {
 
 #include "../common/gles2_cmd_format_autogen.h"
 
-// These are hand written commands.
-// TODO(gman): Attempt to make these auto-generated.
-
-struct GenMailboxCHROMIUM {
-  typedef GenMailboxCHROMIUM ValueType;
-  static const CommandId kCmdId = kGenMailboxCHROMIUM;
-  static const cmd::ArgFlags kArgFlags = cmd::kFixed;
-  static const uint8_t cmd_flags = CMD_FLAG_SET_TRACE_LEVEL(3);
-  CommandHeader header;
-};
-
 #pragma pack(pop)
 
 }  // namespace cmd
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_FORMAT_H_