Remove unneeded JNI registrations.

base/android/important_file_writer_android.cc

Index: base/android/important_file_writer_android.cc
diff --git a/base/android/important_file_writer_android.cc b/base/android/important_file_writer_android.cc
index bcbd785da0449e8e7cf57c919d80cbc4355dcb34..0bc5e671bf05e1188d828ef8a0f78079796c6353 100644
--- a/base/android/important_file_writer_android.cc
+++ b/base/android/important_file_writer_android.cc
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/android/important_file_writer_android.h"
-
 #include <string>
 
 #include "base/android/jni_string.h"
@@ -34,9 +32,5 @@ static jboolean WriteFileAtomically(JNIEnv* env,
   return result;
 }
 
-bool RegisterImportantFileWriterAndroid(JNIEnv* env) {
-  return RegisterNativesImpl(env);
-}
-
 }  // namespace android
 }  // namespace base