Revert "Content handler for python."

mojo/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")
 
 # GYP version: mojo/mojo.gyp:mojo_python
 group("python") {
   deps = [
     ":mojo_embedder",
     ":validation_util",
     "//mojo/public/python",
-    "//mojo/python/content_handler",
   ]
 }
 
 # GYP version: mojo/mojo.gyp:mojo_python_embedder
 python_binary_module("mojo_embedder") {
   cython_sources = [ "system/mojo_embedder.pyx" ]
   deps = [
     "//mojo/edk/system",
   ]
   datadeps = [
@@ skipping 13 matching lines @@
 python_binary_module("validation_util") {
   python_base_module = "mojo_tests"
   cython_sources = [ "system/mojo_tests/validation_util.pyx" ]
   deps = [
     "//mojo/public/cpp/bindings/tests:mojo_public_bindings_test_utils",
   ]
   datadeps = [
     ":tests_module",
   ]
 }