Revert of Implement Android key/value backup

chrome/browser/android/chrome_backup_agent.h

-// Copyright 2016 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.
-
-#ifndef CHROME_BROWSER_ANDROID_CHROME_BACKUP_AGENT_H_
-#define CHROME_BROWSER_ANDROID_CHROME_BACKUP_AGENT_H_
-
-#include <jni.h>
-
-#include <string>
-#include <vector>
-
-#include "base/android/jni_android.h"
-
-namespace chrome {
-namespace android {
-
-std::vector<std::string> GetBackupPrefNames();
-
-bool RegisterBackupAgent(JNIEnv* env);
-
-// Test interface wrapping the static functions that are only called from Java.
-base::android::ScopedJavaLocalRef<jobjectArray> GetBoolBackupNamesForTesting(
-    JNIEnv* env,
-    const base::android::JavaParamRef<jobject>& jcaller);
-base::android::ScopedJavaLocalRef<jbooleanArray> GetBoolBackupValuesForTesting(
-    JNIEnv* env,
-    const base::android::JavaParamRef<jobject>& jcaller);
-void SetBoolBackupPrefsForTesting(
-    JNIEnv* env,
-    const base::android::JavaParamRef<jobject>& jcaller,
-    const base::android::JavaParamRef<jobjectArray>& names,
-    const base::android::JavaParamRef<jbooleanArray>& values);
-
-}  //  namespace android
-}  //  namespace chrome
-
-#endif  // CHROME_BROWSER_ANDROID_CHROME_BACKUP_AGENT_H_