Revert "Content handler for python."

mojo/public/python/BUILD.gn

 # Copyright 2014 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.
 
 import("//third_party/cython/rules.gni")
-import("rules.gni")
 
 group("python") {
   deps = [
     ":bindings",
     ":mojo_system",
     ":mojo_system_impl",
   ]
 }
 
 # GYP version: mojo.gyp:mojo_python_system
@@ skipping 71 matching lines @@
     "mojo_bindings/reflection.py",
     "mojo_bindings/serialization.py",
   ]
   outputs = [
     "$root_out_dir/python/mojo_bindings/{{source_file_part}}",
   ]
   deps = [
     ":mojo_system",
   ]
 }
-
-python_package("packaged_bindings") {
-  sources = [
-    "mojo_bindings/__init__.py",
-    "mojo_bindings/descriptor.py",
-    "mojo_bindings/messaging.py",
-    "mojo_bindings/promise.py",
-    "mojo_bindings/reflection.py",
-    "mojo_bindings/serialization.py",
-  ]
-}