libbrillo: make type_name_undecorate_unittest depend on dbus

type_name_undecorate_unittest fails to build with USE=-dbus due to a transitive
dependency, so move it to the list of tests that depend on dbus.

In file included from libbrillo/brillo/type_name_undecorate_unittest.cc:7:
In file included from libbrillo/brillo/variant_dictionary.h:11:
In file included from libbrillo/brillo/any.h:26:
In file included from libbrillo/brillo/any_internal_impl.h:15:
libbrillo/brillo/dbus/data_serialization.h:63:10: fatal error: 'dbus/message.h' file not found
#include <dbus/message.h>
         ^~~~~~~~~~~~~~~~
1 error generated.

BUG=none
TEST=unittests build with USE=-dbus

Change-Id: I8919781cb0d4b4a9dcfc94988e302e96afbe5ac8
Reviewed-on: https://chromium-review.googlesource.com/477392
Commit-Ready: Stephen Barber <smbarber@chromium.org>
Tested-by: Stephen Barber <smbarber@chromium.org>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
diff --git a/libbrillo.gypi b/libbrillo.gypi
index aedba43..a9a0b1e 100644
--- a/libbrillo.gypi
+++ b/libbrillo.gypi
@@ -394,7 +394,6 @@
             'brillo/streams/stream_unittest.cc',
             'brillo/streams/stream_utils_unittest.cc',
             'brillo/strings/string_utils_unittest.cc',
-            'brillo/type_name_undecorate_unittest.cc',
             'brillo/unittest_utils.cc',
             'brillo/url_utils_unittest.cc',
             'brillo/value_conversion_unittest.cc',
@@ -414,6 +413,7 @@
                 'brillo/dbus/dbus_signal_handler_unittest.cc',
                 'brillo/dbus/exported_object_manager_unittest.cc',
                 'brillo/dbus/exported_property_set_unittest.cc',
+                'brillo/type_name_undecorate_unittest.cc',
                 'brillo/variant_dictionary_unittest.cc',
                 '<(proto_in_dir)/test.proto',
               ],