Merge "DO NOT MERGE Bump AOSP Contacts version to 1.5.15" into ub-contactsdialer-f-dev

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

    package="com.android.contacts"

    android:versionCode="10514"

    android:versionName="1.5.14">

    android:versionCode="10515"

    android:versionName="1.5.15">

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