Revert "[metrics] use libchromeos.pc"

This reverts commit 6ed1d63d859c37e5a3290d4786862d46927aa5c2

Change-Id: If32cadcdb918f66c9cfada8809f2001122a35d69
Reviewed-on: https://gerrit.chromium.org/gerrit/14118
Reviewed-by: Scott James Remnant <keybuk@chromium.org>
Tested-by: Scott James Remnant <keybuk@chromium.org>
diff --git a/metrics/Makefile b/metrics/Makefile
index 46711c8..072fb04 100644
--- a/metrics/Makefile
+++ b/metrics/Makefile
@@ -5,10 +5,8 @@
 # Makefile for metrics utilities -- library, client and daemon
 #
 
-PC_DEPS = dbus-1 glib-2.0 dbus-glib-1 libchromeos
-
-CCONFIG = $(shell $(PKG_CONFIG) --cflags $(PC_DEPS))
-LDCONFIG = $(shell $(PKG_CONFIG) --libs $(PC_DEPS) gthread-2.0)
+CCONFIG = $(shell $(PKG_CONFIG) --cflags dbus-1 glib-2.0 dbus-glib-1)
+LDCONFIG = $(shell $(PKG_CONFIG) --libs dbus-1 glib-2.0 gthread-2.0 dbus-glib-1)
 
 CXXFLAGS += -Wall -Werror -fPIC -fno-exceptions $(CCONFIG)