/usr/share/telepathy/profiles/google-talk.profile is in kde-config-telepathy-accounts 4:15.12.3-0ubuntu1.
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 | <service xmlns="http://telepathy.freedesktop.org/wiki/service-profile-v1"
         id="google-talk"
         type="IM"
         provider="google"
         manager="gabble"
         protocol="jabber"
         icon="im-google-talk">
  <name>Google Talk</name>
  <parameters>
    <parameter name="server"  type="s" mandatory="1">talk.google.com</parameter>
    <parameter name="port"    type="u" mandatory="1">5223</parameter>
    <parameter name="old-ssl" type="b" mandatory="1"
               label="Use old-style SSL">1</parameter>
    <parameter name="fallback-conference-server">groupchat.google.com</parameter>
  </parameters>
  <presences allow-others="1">
    <presence id="available" label="Online"  icon="user-online"/>
    <presence id="busy"   label="Busy" icon="user-busy"/>
    <presence id="hidden" label="Invisible" icon="user-invisible"/>
  </presences>
  <unsupported-channel-classes>
    <!-- this service doesn't support text roomlists -->
    <channel-class>
      <property name="org.freedesktop.Telepathy.Channel.TargetHandleType"
                type="u">3</property>
      <property name="org.freedesktop.Telepathy.Channel.ChannelType"
                type="s">org.freedesktop.Telepathy.Channel.Type.Text</property>
    </channel-class>
  </unsupported-channel-classes>
</service>
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