Add kFlimflamServicePath.

As of now, "/" is used but it should be changed in the future.
See crosbug.com/20135 for details.

BUG=chromium-os:20135
TEST=build libcros using the modified header by emerge-x86-alex system_api libcros

Change-Id: I21581a2b8656e6aa9ed3ab6353a2213c25179e0b
diff --git a/dbus/service_constants.h b/dbus/service_constants.h
index 4561b2c..b095897 100644
--- a/dbus/service_constants.h
+++ b/dbus/service_constants.h
@@ -165,8 +165,9 @@
 namespace flimflam {
 // Flimflam D-Bus service identifiers.
 const char kFlimflamManagerInterface[] = "org.chromium.flimflam.Manager";
-const char kFlimflamServiceInterface[] = "org.chromium.flimflam.Service";
 const char kFlimflamServiceName[] = "org.chromium.flimflam";
+const char kFlimflamServicePath[] = "/";  // crosbug.com/20135
+const char kFlimflamServiceInterface[] = "org.chromium.flimflam.Service";
 const char kFlimflamIPConfigInterface[] = "org.chromium.flimflam.IPConfig";
 const char kFlimflamDeviceInterface[] = "org.chromium.flimflam.Device";
 const char kFlimflamProfileInterface[] = "org.chromium.flimflam.Profile";