This file is indexed.

/usr/share/gconf/schemas/libcanberra.schemas is in libcanberra-gtk-module 0.28-3ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?xml version="1.0"?>
<gconfschemafile>
  <schemalist>
    <schema>
      <key>/schemas/apps/gnome_settings_daemon/gtk-modules/canberra-gtk-module</key>
      <applyto>/apps/gnome_settings_daemon/gtk-modules/canberra-gtk-module</applyto>
      <owner>libcanberra</owner>
      <type>bool</type>
      <default>true</default>
      <locale name="C">
        <short>GTK+ module for event sounds</short>
        <long>This key determines the GTK+ module to load for event sound support.</long>
      </locale>
    </schema>
  </schemalist>
</gconfschemafile>