GN: Fix up net_unittests to match GYP

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/toolchain/toolchain.gni")
 import("//third_party/android_platform/config.gni")
 import("//tools/grit/grit_rule.gni")
@@ skipping 1762 matching lines @@
     unittests_binary = "lib${test_suite_name}${shlib_extension}"
   }
 
   if (defined(invoker.apk_name)) {
     apk_name = invoker.apk_name
   } else {
     apk_name = test_suite_name
   }
 
   android_apk(target_name) {
-    forward_variables_from(invoker, [ "asset_location" ])
+    forward_variables_from(invoker,
+                           [
+                             "asset_location",
+                             "android_manifest",
+                           ])
     final_apk_path = "$root_build_dir/${apk_name}_apk/${apk_name}-debug.apk"
     java_files = [
       "//testing/android/native_test/java/src/org/chromium/native_test/NativeBrowserTestActivity.java",
       "//testing/android/native_test/java/src/org/chromium/native_test/NativeTestActivity.java",
       "//testing/android/native_test/java/src/org/chromium/native_test/NativeUnitTestActivity.java",
       "//testing/android/native_test/java/src/org/chromium/native_test/NativeTestInstrumentationTestRunner.java",
     ]
-    android_manifest = "//testing/android/native_test/java/AndroidManifest.xml"
+    if (!defined(invoker.android_manifest)) {
+      android_manifest =
+          "//testing/android/native_test/java/AndroidManifest.xml"
+    }
     native_libs = [ unittests_binary ]
     deps = [
       "//base:base_java",
       "//build/android/pylib/remote/device/dummy:remote_device_dummy_apk",
       "//testing/android/appurify_support:appurify_support_java",
       "//testing/android/reporter:reporter_java",
     ]
     if (defined(invoker.deps)) {
       deps += invoker.deps
     }
@@ skipping 226 matching lines @@
   }
 
   android_library(target_name) {
     java_files = []
     srcjar_deps = [ ":${_template_name}__protoc_java" ]
     deps = [
       "//third_party/android_protobuf:protobuf_nano_javalib",
     ]
   }
 }