jni_generator: Always generate native exports.

base/android/jni_generator/testConstantsFromJavaP.golden

 // Copyright 2014 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"
 
 #include "base/android/jni_int_wrapper.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;
-#define MotionEvent_clazz(env) g_MotionEvent_clazz
+base::subtle::AtomicWord g_MotionEvent_clazz __attribute__((unused)) = 0;
+#define MotionEvent_clazz(env) base::android::LazyGetClass(env, kMotionEventClassPath, &g_MotionEvent_clazz)
 
 }  // namespace
 
 namespace JNI_MotionEvent {
 
 enum Java_MotionEvent_constant_fields {
   INVALID_POINTER_ID = -1,
   ACTION_MASK = 255,
   ACTION_DOWN = 0,
   ACTION_UP = 1,
@@ skipping 2174 matching lines @@
 
      env->CallVoidMethod(obj,
           method_id, p0, as_jint(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()));
+  if (base::android::IsManualJniRegistrationDisabled()) return true;
 
   return true;
 }
 
 }  // namespace JNI_MotionEvent
 
 #endif  // android_view_MotionEvent_JNI