session-android/res/values-v23/themes.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="TextSecure.LightRegistrationTheme" parent="TextSecure.LightNoActionBar">
        <item name="android:windowLightStatusBar">true</item>
        <item name="android:statusBarColor">@color/core_grey_02</item>
    </style>

    <style name="TextSecure.DarkRegistrationTheme" parent="TextSecure.DarkNoActionBar">
        <item name="android:windowLightStatusBar">false</item>
        <item name="android:statusBarColor">@color/core_black</item>
    </style>
</resources>