Remove all .gyp and .gypi files.

build/android/ndk.gyp

Index: build/android/ndk.gyp
diff --git a/build/android/ndk.gyp b/build/android/ndk.gyp
deleted file mode 100644
index 2838a9857e991184cf3a7adf039b8d380dd6fb4b..0000000000000000000000000000000000000000
--- a/build/android/ndk.gyp
+++ /dev/null
@@ -1,20 +0,0 @@
-# Copyright (c) 2015 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.
-
-{
-  'targets': [
-    {
-      'target_name': 'cpu_features',
-      'type': 'static_library',
-      'direct_dependent_settings': {
-        'include_dirs': [
-          '<(android_ndk_root)/sources/android/cpufeatures',
-        ],
-      },
-      'sources': [
-        '<(android_ndk_root)/sources/android/cpufeatures/cpu-features.c',
-      ],
-    },
-  ],
-}