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/usr/share/glib-2.0/schemas/com.canonical.indicator.messages.gschema.xml is in indicator-messages 13.10.1+17.04.20170120-0ubuntu2.

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The actual contents of the file can be viewed below.

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<schemalist>
  <schema id="com.canonical.indicator.messages" path="/com/canonical/indicator/messages/" gettext-domain="indicator-messages">
    <key name="applications" type="as">
      <summary>List of applications that are shown in the messaging menu</summary>
      <description>
        Applications corresponding to the desktop file ids in this list are shown in the messaging menu.
      </description>
      <default>[]</default>
    </key>
  </schema>
</schemalist>