Merge "DO NOT MERGE Bump version of AOSP Contacts to 1.6.19" into ub-contactsdialer-h-dev

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.android.contacts"

    android:versionCode="10618"

    android:versionName="1.6.18">

    android:versionCode="10619"

    android:versionName="1.6.19">

    <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="25" />