base: Remove unneeded RegisterNatives() calls on Android

base/android/callback_android.cc

Index: base/android/callback_android.cc
diff --git a/base/android/callback_android.cc b/base/android/callback_android.cc
index abcec2f85a981316ade838c93086fd75ab816d0c..8c56f9896dc6d039bc820604b7976201962c1910 100644
--- a/base/android/callback_android.cc
+++ b/base/android/callback_android.cc
@@ -27,9 +27,5 @@ void RunCallbackAndroid(const JavaRef<jobject>& callback, int arg) {
                                       callback.obj(), arg);
 }
 
-bool RegisterCallbackAndroid(JNIEnv* env) {
-  return RegisterNativesImpl(env);
-}
-
 }  // namespace android
 }  // namespace base