Android: Remove unneeded RegisterNatives() calls

device/usb/usb_interface_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 DEVICE_USB_USB_INTERFACE_ANDROID_H_
 #define DEVICE_USB_USB_INTERFACE_ANDROID_H_
 
 #include "base/android/scoped_java_ref.h"
 #include "device/usb/usb_descriptors.h"
 
 namespace device {
 
 class UsbInterfaceAndroid {
  public:
-  // Register C++ methods exposed to Java using JNI.
-  static bool RegisterJNI(JNIEnv* env);
-
   static UsbInterfaceDescriptor Convert(
       JNIEnv* env,
       const base::android::JavaRef<jobject>& usb_interface);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_USB_USB_INTERFACE_ANDROID_H_