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/usr/share/gtksourceview-3.0/language-specs/chdr.lang is in libgtksourceview-3.0-common 3.18.2-1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<!--

 This file is part of GtkSourceView

 Authors: Marco Barisione, Emanuele Aina
 Copyright (C) 2005-2007 Marco Barisione <barisione@gmail.com>
 Copyright (C) 2005-2007 Emanuele Aina

 GtkSourceView is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 GtkSourceView is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

-->
<language id="chdr" _name="C/C++/ObjC Header" version="2.0" _section="Source">
  <metadata>
    <property name="mimetypes">text/x-chdr</property>
    <property name="globs">*.h</property>
    <property name="line-comment-start">//</property>
    <property name="block-comment-start">/*</property>
    <property name="block-comment-end">*/</property>
  </metadata>

  <!--
    We include C++ and ObjC contexts since the .h extension
    is also used for those languages. If you use .hh
    or similar, we will use cpphdr.lang which is
    basically the same thing, but having a separate lang file
    allows a program to apply a language specific behavior,
    for instance a different style for C++ headers.
  -->
  <definitions>
    <context id="chdr">
      <include>
        <context ref="objc:objc-header"/>
        <context ref="cpp:cpp-proper"/>
        <context ref="c:c"/>
      </include>
    </context>
  </definitions>
</language>