Android: Remove unneeded RegisterNatives() calls

media/midi/midi_device_android.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 MEDIA_MIDI_MIDI_DEVICE_ANDROID_H_
 #define MEDIA_MIDI_MIDI_DEVICE_ANDROID_H_
 
 #include <jni.h>
 #include <string>
 
@@ skipping 20 matching lines @@
   const ScopedVector<MidiInputPortAndroid>& input_ports() const {
     return input_ports_;
   }
   const ScopedVector<MidiOutputPortAndroid>& output_ports() const {
     return output_ports_;
   }
   bool HasRawDevice(JNIEnv* env, jobject raw_device) const {
     return env->IsSameObject(raw_device_.obj(), raw_device);
   }
 
-  static bool Register(JNIEnv* env);
-
  private:
   base::android::ScopedJavaGlobalRef<jobject> raw_device_;
   ScopedVector<MidiInputPortAndroid> input_ports_;
   ScopedVector<MidiOutputPortAndroid> output_ports_;
 };
 
 }  // namespace midi
 }  // namespace media
 
 #endif  // MEDIA_MIDI_MIDI_DEVICE_ANDROID_H_