Revert of Implement Android key/value backup

chrome/browser/android/chrome_backup_watcher.cc

Index: chrome/browser/android/chrome_backup_watcher.cc
diff --git a/chrome/browser/android/chrome_backup_watcher.cc b/chrome/browser/android/chrome_backup_watcher.cc
deleted file mode 100644
index da084fec68ea4f4a7644f90a155d08629de39c49..0000000000000000000000000000000000000000
--- a/chrome/browser/android/chrome_backup_watcher.cc
+++ /dev/null
@@ -1,38 +0,0 @@
-// 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.
-
-#include "chrome/browser/android/chrome_backup_agent.h"
-#include "chrome/browser/android/chrome_backup_watcher.h"
-#include "chrome/browser/profiles/profile.h"
-#include "jni/ChromeBackupWatcher_jni.h"
-
-namespace chrome {
-namespace android {
-
-namespace {
-
-void BackupPrefsChanged(
-    const base::android::ScopedJavaGlobalRef<jobject>& java_watcher) {
-  Java_ChromeBackupWatcher_onBackupPrefsChanged(
-      base::android::AttachCurrentThread(), java_watcher);
-}
-}
-
-ChromeBackupWatcher::ChromeBackupWatcher(Profile* profile) {
-  JNIEnv* env = base::android::AttachCurrentThread();
-  // Create the Java class, and start watching the Android (Java) preferences
-  java_watcher_.Reset(Java_ChromeBackupWatcher_createChromeBackupWatcher(env));
-  // Now watch the Chrome C++ preferences
-  registrar_.Init(profile->GetPrefs());
-  base::RepeatingClosure callback =
-      base::BindRepeating(&BackupPrefsChanged, java_watcher_);
-  for (const std::string pref_name : GetBackupPrefNames()) {
-    registrar_.Add(pref_name, callback);
-  }
-}
-
-ChromeBackupWatcher::~ChromeBackupWatcher() {}
-
-}  //  namespace android
-}  //  namespace chrome