Use combined native/manual JNI registration.

android_webview/libwebviewchromium.gypi

 # 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.
 {
   'type': 'shared_library',
   'android_unmangled_name': 1,
   'dependencies': [
     'android_webview_common',
   ],
+  'variables': {
+    'use_native_jni_exports': 1,
+  },
   'conditions': [
     [ 'android_webview_build==1', {
       'dependencies': [
         # When building inside the android tree we also need to depend on all
         # the java sources generated from templates which will be needed by
         # android_webview_java in android_webview/java_library_common.mk.
         '../base/base.gyp:base_java_application_state',
         '../base/base.gyp:base_java_library_load_from_apk_status_codes',
         '../base/base.gyp:base_java_library_process_type',
         '../base/base.gyp:base_java_memory_pressure_level',
@@ skipping 29 matching lines @@
       # android.
       'aosp_build_settings': {
         'LOCAL_FDO_SUPPORT': 'true',
       },
     }],
   ],
   'sources': [
     'lib/main/webview_entry_point.cc',
   ],
 }