[Android O] Initialize notification channels on OS upgrade

chrome/android/java/src/org/chromium/chrome/browser/upgrade/PackageReplacedBroadcastReceiver.java

Index: chrome/android/java/src/org/chromium/chrome/browser/upgrade/PackageReplacedBroadcastReceiver.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/upgrade/PackageReplacedBroadcastReceiver.java b/chrome/android/java/src/org/chromium/chrome/browser/upgrade/PackageReplacedBroadcastReceiver.java
index da0761fd6c011ce5c8bce00f601fea2e2988fe77..4adb9e4ef3127f368c56dfeceafd49b33b1106c6 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/upgrade/PackageReplacedBroadcastReceiver.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/upgrade/PackageReplacedBroadcastReceiver.java
@@ -7,7 +7,6 @@ package org.chromium.chrome.browser.upgrade;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
-import android.os.AsyncTask;
 import android.os.Build;
 
 import org.chromium.chrome.browser.notifications.ChannelsUpdater;
@@ -37,16 +36,6 @@ public final class PackageReplacedBroadcastReceiver extends BroadcastReceiver {
 
     private void updateChannelsIfNecessary() {
         if (!ChannelsUpdater.getInstance().shouldUpdateChannels()) return;
-
-        final PendingResult result = goAsync();
-        new AsyncTask<Void, Void, Void>() {
-            @Override
-            protected Void doInBackground(Void... params) {
-                ChannelsUpdater.getInstance().updateChannels();
-                result.finish();
-                return null;
-            }
-        }
-                .executeOnExecutor(AsyncTask.SERIAL_EXECUTOR);
+        ChannelsUpdater.getInstance().updateChannelsInBackground(goAsync());
     }
 }