Merge "Remove unused progress bar in DocumentsUI." into nyc-andromeda-dev

    <!-- column headers are empty on small screens, in portrait or in grid mode. -->

    <include layout="@layout/column_headers"/>

    <ProgressBar

        android:id="@+id/progressbar"

        android:layout_width="match_parent"

        android:layout_height="@dimen/progress_bar_height"

        android:indeterminate="true"

        style="@style/TrimmedHorizontalProgressBar"

        android:visibility="gone"/>

    <FrameLayout

        android:id="@+id/container_directory"

        android:clipToPadding="false"