Android JNI gen: Don't emit code for empty RegisterNatives()

chromecast/base/android/dumpstate_writer.h

 // Copyright 2015 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.
 
 #ifndef CHROMECAST_BASE_ANDROID_DUMPSTATE_WRITER_H_
 #define CHROMECAST_BASE_ANDROID_DUMPSTATE_WRITER_H_
 
 #include <jni.h>
 
 #include <string>
 
 #include "base/macros.h"
 
 namespace chromecast {
 
 // JNI wrapper for DumpstateWriter.java.
 class DumpstateWriter {
  public:
-  static bool RegisterJni(JNIEnv* env);
   static void AddDumpValue(const std::string& name, const std::string& value);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(DumpstateWriter);
 };
 
 }  // namespace chromecast
 
 #endif  // CHROMECAST_BASE_ANDROID_DUMPSTATE_WRITER_H_