Reorder default_android_ndk_major_version declarations.

build/config/android/config.gni

 # 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 contains common system config stuff for the Android build.
 
 if (is_android) {
   assert(rebase_path("//", root_build_dir) == "../../",
          "Android output directory must be nested 2 levels within src/ (" +
              "e.g.: out-gn/Debug). http://crbug.com/412935")
 
   import("//build_overrides/build.gni")
 
   has_chrome_android_internal =
       exec_script("//build/dir_exists.py",
                   [ rebase_path("//clank", root_build_dir) ],
                   "string") == "True"
 
   if (has_chrome_android_internal) {
     import("//clank/config.gni")
   }
 
   if (!defined(extra_chrome_shared_library_configs)) {
     extra_chrome_shared_library_configs = []
   }
 
   if (!defined(default_android_ndk_root)) {
-    default_android_ndk_major_version = "10"
     default_android_ndk_root = "//third_party/android_tools/ndk"
     default_android_ndk_version = "r10e"
+    default_android_ndk_major_version = "10"
   } else {
     assert(defined(default_android_ndk_version))
+    assert(defined(default_android_ndk_major_version))
   }
 
   # The same version of lint should be used for building all targets,
   # and these args ensure that the upstream version of lint is used for
   # both upstream and downstream targets.
   lint_android_sdk_root = "//third_party/android_tools/sdk"
   lint_android_sdk_version = "23"
 
   if (!defined(default_android_sdk_root)) {
     # Reuse the lint variables to ensure that the lint version gets updated
@@ skipping 20 matching lines @@
         "//third_party/android_tools:google_play_services_default_resources"
   }
 
   webview_public_framework_jar =
       "//third_party/android_platform/webview/frameworks_6.0.jar"
   if (!defined(webview_framework_jar)) {
     webview_framework_jar = webview_public_framework_jar
   }
 
   declare_args() {
-    android_ndk_major_version = default_android_ndk_major_version
     android_ndk_root = default_android_ndk_root
     android_ndk_version = default_android_ndk_version
+    android_ndk_major_version = default_android_ndk_major_version
 
     android_sdk_root = default_android_sdk_root
     android_sdk_version = default_android_sdk_version
     android_sdk_build_tools_version = default_android_sdk_build_tools_version
 
     # Libc++ library directory. Override to use a custom libc++ binary.
     android_libcpp_lib_dir = ""
 
     # Android versionCode for android_apk()s that don't expclitly set one.
     android_default_version_code = "1"
@@ skipping 236 matching lines @@
           "//build/toolchain/android:${android_secondary_abi_cpu}"
     }
   }
 }
 
 declare_args() {
   # Enables used resource whitelist generation. Set for official builds only
   # as a large amount of build output is generated.
   enable_resource_whitelist_generation = is_android && is_official_build
 }