Move NDK gyp file from third_party/android_tools.

build/android/cpufeatures.gypi

 # Copyright (c) 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.
 
 # Depend on the Android NDK's cpu feature detection. The WebView build is part
 # of the system and the library already exists; for the normal build there is a
 # gyp file in the checked-in NDK to build it.
 {
   'conditions': [
     ['android_webview_build == 1', {
       # This is specified twice intentionally: Android provides include paths
       # to targets automatically if they depend on libraries, so we add this
       # library to every target that includes this .gypi to make the headers
       # available, then also add it to targets that link those targets via
       # link_settings to ensure it ends up being linked even if the main target
       # doesn't include this .gypi.
       'libraries': [
         'cpufeatures.a',
       ],
       'link_settings': {
         'libraries': [
           'cpufeatures.a',
         ],
       },
     }, {
       'dependencies': [
-        '<(android_ndk_root)/android_tools_ndk.gyp:cpu_features',
+        '<(DEPTH)/build/android/ndk.gyp:cpu_features',
       ],
     }],
   ],
 }