Remove unneeded JNI registrations.

chrome/browser/android/field_trial_helper.cc

 // Copyright 2013 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.
 
-#include "chrome/browser/android/field_trial_helper.h"
-
 #include <jni.h>
 
 #include "base/android/jni_string.h"
 #include "base/metrics/field_trial.h"
 #include "jni/FieldTrialHelper_jni.h"
 
 using base::android::ConvertJavaStringToUTF8;
 using base::android::ConvertUTF8ToJavaString;
 
 static jstring GetFieldTrialFullName(JNIEnv* env,
                                      jclass clazz,
                                      jstring jtrial_name) {
   std::string trial_name(ConvertJavaStringToUTF8(env, jtrial_name));
   return ConvertUTF8ToJavaString(
       env,
       base::FieldTrialList::FindFullName(trial_name)).Release();
 }
-
-namespace chrome {
-namespace android {
-
-bool RegisterFieldTrialHelper(JNIEnv* env) {
-  return RegisterNativesImpl(env);
-}
-
-}  // namespace android
-}  // namespace chrome