dbus: fix base class of ErrorResponse

dbus: fix base class of ErrorResponse

dbus::ErrorResponse needs to be a subclass of dbus::Response otherwise
you can't pass it to a dbus::ExportedObject::ResponseSender.

BUG=none
TEST=my code now compiles

Change-Id: I1efba7c2cd9aaed937cac75133ab6b695aeac63b


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=126053

[satorux1, 2012-03-10 00:09:17]

LGTM

[commit-bot: I haz the power, 2012-03-10 00:32:32]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/keybuk@chromium.org/9675002/1

[commit-bot: I haz the power, 2012-03-10 00:50:19]

Try job failure for 9675002-1 (retry) on linux_chromeos for step "compile"
(clobber build).
It's a second try, previously, step "compile" failed.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_chro...

[commit-bot: I haz the power, 2012-03-10 00:50:27]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/keybuk@chromium.org/9675002/3002

[commit-bot: I haz the power, 2012-03-10 03:29:10]

Try job failure for 9675002-3002 (retry) on win_rel for step "browser_tests".
It's a second try, previously, step "browser_tests" failed.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[commit-bot: I haz the power, 2012-03-10 19:55:15]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/keybuk@chromium.org/9675002/3002

[commit-bot: I haz the power, 2012-03-11 01:12:01]

Change committed as 126053