Use combined native/manual JNI registration.

android_webview/lib/main/webview_entry_point.cc

 // 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.
 
 #include "android_webview/lib/main/webview_jni_onload_delegate.h"
 #include "base/android/jni_android.h"
 #include "content/public/app/content_jni_onload.h"
 
 // This is called by the VM when the shared library is first loaded.
 // Most of the initialization is done in LibraryLoadedOnMainThread(), not here.
 JNI_EXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) {
+  // WebView uses native JNI exports; disable manual JNI registration to
+  // improve startup peformance.
+  base::android::DisableManualJniRegistration();
+
   if (!android_webview::OnJNIOnLoad(vm))
     return -1;
 
   return JNI_VERSION_1_4;
 }