/usr/share/gconf/schemas/charpick.schemas is in gnome-applets-data 3.5.92-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | <gconfschemafile>
    <schemalist>
                
      <schema>
        <key>/schemas/apps/charpick/prefs/default_list</key>
        <owner>charpick_applet2</owner>
        <type>string</type>
        <gettext_domain>gnome-applets-3.0</gettext_domain>
        <locale name="C">
          <short>DEPRECATED - Characters shown on applet startup</short>
          <long></long>
        </locale>
      </schema>
      
      <schema>
        <key>/schemas/apps/charpick/prefs/current_list</key>
        <owner>charpick_applet2</owner>
        <type>string</type>
        <gettext_domain>gnome-applets-3.0</gettext_domain>
        <locale name="C">
          <short>Characters shown on applet startup</short>
          <long>The string that the user had selected when the applet was last used. This string will be displayed when the user starts the applet.</long>
        </locale>
      </schema>
      
      <schema>
        <key>/schemas/apps/charpick/prefs/chartable</key>
        <owner>charpick_applet2</owner>
        <type>list</type>
        <list_type>string</list_type>
        <gettext_domain>gnome-applets-3.0</gettext_domain>
        <locale name="C">
          <short>List of available palettes</short>
          <long>List of strings containing the available palettes.</long>
        </locale>
      </schema>
      
    </schemalist>
</gconfschemafile>  
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