Remove python bindings unittests from the build.

mojo/python/tests/BUILD.gn

Index: mojo/python/tests/BUILD.gn
diff --git a/mojo/python/tests/BUILD.gn b/mojo/python/tests/BUILD.gn
deleted file mode 100644
index 0d2949d1490c044cfeeb949e9942b7bc9d43ffca..0000000000000000000000000000000000000000
--- a/mojo/python/tests/BUILD.gn
+++ /dev/null
@@ -1,24 +0,0 @@
-# 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")
-
-group("tests") {
-  deps = [
-    ":test_core",
-  ]
-}
-
-action("test_core") {
-  script = "test_core.py"
-  outputs = [
-    "$root_out_dir/no_file",
-  ]
-  inputs = []
-  deps = [
-    "//mojo/public/python:system",
-    "//mojo/python:embedder",
-  ]
-  args = [ rebase_path("$root_out_dir/python", root_build_dir) ]
-}