Allow placeholders when the native_libs is empty.

build/config/android/rules.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.
 
 import("//base/android/linker/config.gni")
 import("//build/config/android/config.gni")
 import("//build/config/android/internal_rules.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/toolchain/toolchain.gni")
 import("//third_party/android_platform/config.gni")
@@ skipping 1720 matching lines @@
             ]
 
     if ((_native_libs != [] || _extra_native_libs_even_when_incremental != []) && !_create_abi_split) {
       deps += _native_libs_deps + _extra_native_libs_deps +
               _extra_native_libs_even_when_incremental_deps +
               [ _native_libs_file_arg_dep ]
       native_libs_filearg = _native_libs_file_arg
       native_libs = _extra_native_libs
       native_libs_even_when_incremental =
           _extra_native_libs_even_when_incremental
+    }
 
-      # Placeholders necessary for some older devices.
-      # http://crbug.com/395038
-      forward_variables_from(invoker, [ "native_lib_placeholders" ])
-    }
+    # Placeholders necessary for some older devices.
+    # http://crbug.com/395038
+    forward_variables_from(invoker, [ "native_lib_placeholders" ])
   }
 
   if ((_native_libs != [] || _extra_native_libs_even_when_incremental != []) &&
       _create_abi_split) {
     _manifest_rule = "${_template_name}__split_manifest_abi_${android_app_abi}"
     generate_split_manifest(_manifest_rule) {
       main_manifest = _android_manifest
       out_manifest =
           "$gen_dir/split-manifests/${android_app_abi}/AndroidManifest.xml"
       split_name = "abi_${android_app_abi}"
@@ skipping 498 matching lines @@
   }
 
   android_library(target_name) {
     java_files = []
     srcjar_deps = [ ":${_template_name}__protoc_java" ]
     deps = [
       "//third_party/android_protobuf:protobuf_nano_javalib",
     ]
   }
 }