init: remove superfluous forward definitions

Test: Boot bullhead
Change-Id: I4a005616a825529bc2ad1b413e51b501f6407cbd
diff --git a/init/init.h b/init/init.h
index 3768c02..b4d25fb 100644
--- a/init/init.h
+++ b/init/init.h
@@ -19,9 +19,6 @@
 
 #include <string>
 
-class Action;
-class Service;
-
 extern const char *ENV[32];
 extern std::string default_console;
 extern struct selabel_handle *sehandle;