Remove unneeded JNI registrations.

base/android/jni_generator/testConstantsFromJavaP.golden

-// Copyright 2014 The Chromium Authors. All rights reserved.
+// 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.
 
 // This file is autogenerated by
 //     base/android/jni_generator/jni_generator.py
 // For
 //     android/view/MotionEvent
 
 #ifndef android_view_MotionEvent_JNI
 #define android_view_MotionEvent_JNI
 
 #include <jni.h>
 
 #include "base/android/jni_generator/jni_generator_helper.h"
 
 // Step 1: forward declarations.
 namespace {
 const char kMotionEventClassPath[] = "android/view/MotionEvent";
 // Leaking this jclass as we cannot use LazyInstance from some threads.
 jclass g_MotionEvent_clazz = NULL;
 
 }  // namespace
 
 namespace JNI_MotionEvent {
+extern "C"{
 
 enum Java_MotionEvent_constant_fields {
   INVALID_POINTER_ID = -1,
   ACTION_MASK = 255,
   ACTION_DOWN = 0,
   ACTION_UP = 1,
   ACTION_MOVE = 2,
   ACTION_CANCEL = 3,
   ACTION_OUTSIDE = 4,
   ACTION_POINTER_DOWN = 5,
@@ skipping 2157 matching lines @@
       env, g_MotionEvent_clazz,
       "writeToParcel",
       "(Landroid/os/Parcel;I)V",
       &g_MotionEvent_writeToParcel);
 
      env->CallVoidMethod(obj,
           method_id, p0, p1);
   jni_generator::CheckException(env);
 
 }
+};
 
 // Step 3: RegisterNatives.
-
 static bool RegisterNativesImpl(JNIEnv* env) {
   g_MotionEvent_clazz = reinterpret_cast<jclass>(env->NewGlobalRef(
       base::android::GetClass(env, kMotionEventClassPath).obj()));
 
   return true;
 }
 
 }  // namespace JNI_MotionEvent
 
 #endif  // android_view_MotionEvent_JNI