Revert of [Android] JUnit runner + gyp changes.

build/host_prebuilt_jar.gypi

-# 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.
-
-# This file is meant to be included into a target to provide a rule to
-# copy a prebuilt JAR for use on a host to the output directory.
-#
-# To use this, create a gyp target with the following form:
-# {
-#   'target_name': 'my_prebuilt_jar',
-#   'type': 'none',
-#   'variables': {
-#     'jar_path': 'path/to/prebuilt.jar',
-#   },
-#   'includes': [ 'path/to/this/gypi/file' ],
-# }
-#
-# Required variables:
-#   jar_path - The path to the prebuilt jar.
-
-{
-  'dependencies': [
-  ],
-  'variables': {
-    'dest_path': '<(PRODUCT_DIR)/lib.java/<(_target_name).jar',
-    'src_path': '<(jar_path)',
-  },
-  'all_dependent_settings': {
-    'variables': {
-      'input_jars_paths': [
-        '<(dest_path)',
-      ]
-    },
-  },
-  'actions': [
-    {
-      'action_name': 'copy_prebuilt_jar',
-      'message': 'Copy <(src_path) to <(dest_path)',
-      'inputs': [
-        '<(src_path)',
-      ],
-      'outputs': [
-        '<(dest_path)',
-      ],
-      'action': [
-        'python', '<(DEPTH)/build/cp.py', '<(src_path)', '<(dest_path)',
-      ],
-    }
-  ]
-}