Correct misleading install-location comments

These conf files are installed in /opt/google/chrome/dbus not
/etc/dbus-1/system.d/.

Change-Id: I1d3d454662fbcfc56f05112dbd97ec83e6e2281a
Reviewed-on: https://chromium-review.googlesource.com/1067567Reviewed-by: Dan Erat <derat@chromium.org>
Commit-Queue: Andrew Moylan <amoylan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560983}

chromeos/dbus/services/org.chromium.DisplayService.conf

@@ -5,7 +5,7 @@
   Use of this source code is governed by a BSD-style license that can be
   found in the LICENSE file.
 
-  This file will be installed at /etc/dbus-1/system.d on Chromium OS.
+  This file will be installed at /opt/google/chrome/dbus on Chromium OS.
 -->
 <busconfig>
   <policy user="chronos">

chromeos/dbus/services/org.chromium.LivenessService.conf

@@ -5,7 +5,7 @@
   Use of this source code is governed by a BSD-style license that can be
   found in the LICENSE file.
 
-  This file will be installed at /etc/dbus-1/system.d on Chromium OS.
+  This file will be installed at /opt/google/chrome/dbus on Chromium OS.
 -->
 <busconfig>
   <policy user="chronos">