Remove GenMailboxCHROMIUM command

gpu/command_buffer/build_gles2_cmd_buffer.py

 #!/usr/bin/env python
 # 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.
 
 """code generator for GLES2 command buffers."""
 
 import itertools
 import os
 import os.path
@@ skipping 2914 matching lines @@
     'gl_test_func': 'glGenerateMipmapEXT',
     'trace_level': 1,
   },
   'GenBuffers': {
     'type': 'GENn',
     'gl_test_func': 'glGenBuffersARB',
     'resource_type': 'Buffer',
     'resource_types': 'Buffers',
   },
   'GenMailboxCHROMIUM': {
-    'type': 'HandWritten',
+    'type': 'Manual',
+    'gen_cmd': 'False',
     'impl_func': False,
     'extension': "CHROMIUM_texture_mailbox",
     'chromium': True,
   },
   'GenFramebuffers': {
     'type': 'GENn',
     'gl_test_func': 'glGenFramebuffersEXT',
     'resource_type': 'Framebuffer',
     'resource_types': 'Framebuffers',
   },
@@ skipping 8620 matching lines @@
   Format(gen.generated_cpp_filenames)
 
   if gen.errors > 0:
     print "%d errors" % gen.errors
     return 1
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))