Remove dependencies on Android's forked decoder libraries

gyp/libjpeg.gyp

-# Copyright 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.
-
-# This is a copy of ../third_party/externals/libjpeg/libjpeg.gyp , modified
-# such that all source paths point into that directory.
-# See http://code.google.com/p/skia/issues/detail?id=543 ('wrap libjpeg.gyp
-# from Chrome's libjpeg port, rather than making our own copy') for a better
-# long-term solution.
-
-{
-  'variables': {
-    'use_system_libjpeg%': 0,
-    'skia_warnings_as_errors': 0,
-  },
-  'conditions': [
-    ['skia_os == "android"', {
-      'targets': [
-        {
-          'target_name': 'libjpeg',
-          'type': 'none',
-          'dependencies': [
-            'android_deps.gyp:jpeg',
-          ],
-          'export_dependent_settings': [
-            'android_deps.gyp:jpeg',
-          ],
-        },
-      ],
-    }, { # skia_os != android
-      'targets': [
-        {
-          'target_name': 'libjpeg',
-          'type': 'none',
-          'dependencies': [
-            'libjpeg-turbo.gyp:libjpeg-turbo',
-          ],
-          'export_dependent_settings': [
-            'libjpeg-turbo.gyp:libjpeg-turbo',
-          ],
-        },
-      ],
-    }],
-  ],
-}