Revert of Implement Android key/value backup

chrome/android/java/src/org/chromium/chrome/browser/ChromeBackupWatcher.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ChromeBackupWatcher.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ChromeBackupWatcher.java b/chrome/android/java/src/org/chromium/chrome/browser/ChromeBackupWatcher.java
deleted file mode 100644
index 554b054c57e220a5432cff9127047d3ebf4d800e..0000000000000000000000000000000000000000
--- a/chrome/android/java/src/org/chromium/chrome/browser/ChromeBackupWatcher.java
+++ /dev/null
@@ -1,65 +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.
-
-package org.chromium.chrome.browser;
-
-import android.app.backup.BackupManager;
-import android.content.Context;
-import android.content.SharedPreferences;
-
-import org.chromium.base.ContextUtils;
-import org.chromium.base.VisibleForTesting;
-import org.chromium.base.annotations.CalledByNative;
-import org.chromium.base.annotations.JNINamespace;
-import org.chromium.components.signin.ChromeSigninController;
-
-/**
- * Class for watching for changes to the Android preferences that are backed up using Android
- * key/value backup.
- */
-@JNINamespace("chrome::android")
-public class ChromeBackupWatcher {
-    private BackupManager mBackupManager;
-
-    @VisibleForTesting
-    @CalledByNative
-    static ChromeBackupWatcher createChromeBackupWatcher() {
-        return new ChromeBackupWatcher();
-    }
-
-    private ChromeBackupWatcher() {
-        Context context = ContextUtils.getApplicationContext();
-        if (context == null) return;
-
-        mBackupManager = new BackupManager(context);
-        // Watch the Java preferences that are backed up.
-        SharedPreferences sharedPrefs = ContextUtils.getAppSharedPreferences();
-        sharedPrefs.registerOnSharedPreferenceChangeListener(
-                new SharedPreferences.OnSharedPreferenceChangeListener() {
-
-                    @Override
-                    public void onSharedPreferenceChanged(
-                            SharedPreferences sharedPreferences, String key) {
-                        // Update the backup if the user id or any of the backed up Android
-                        // preferences change.
-                        if (key.equals(ChromeSigninController.SIGNED_IN_ACCOUNT_KEY)) {
-                            onBackupPrefsChanged();
-                            return;
-                        }
-                        for (String pref : ChromeBackupAgent.BACKUP_ANDROID_BOOL_PREFS) {
-                            if (key.equals(pref)) {
-                                onBackupPrefsChanged();
-                                return;
-                            }
-                        }
-                    }
-
-                });
-    }
-
-    @CalledByNative
-    private void onBackupPrefsChanged() {
-        mBackupManager.dataChanged();
-    }
-}