Merge "Revert new app installed notification doc" into qt-dev

 * <p>

 * The ApiDemos project contains examples of using this API:

 * <code>ApiDemos/src/com/example/android/apis/content/InstallApk*.java</code>.

 * <p>

 * On Android Q or above, an app installed notification will be posted

 * by system after a new app is installed.

 * To customize installer's notification icon, you should declare the following in the manifest

 * &lt;application> as follows: </p>

 * <pre>

 * <meta-data android:name="com.android.packageinstaller.notification.smallIcon"

 * android:resource="@drawable/installer_notification_icon"/>

 * </pre>

 * <pre>

 * <meta-data android:name="com.android.packageinstaller.notification.color"

 * android:resource="@color/installer_notification_color"/>

 * </pre>

 */

public class PackageInstaller {

    private static final String TAG = "PackageInstaller";