Fix MOZ_TRACK_MODULE_DEPS bustage.

caps/src/Makefile.in

@@ -29,7 +29,7 @@ include $(DEPTH)/config/autoconf.mk
 MODULE		= caps
 LIBRARY_NAME	= caps
 IS_COMPONENT	= 1
-REQUIRES	= xpcom string pref js dom xpconnect necko jar widget plugin intl locale layout appshell
+REQUIRES	= xpcom string pref js dom xpconnect necko jar widget plugin intl locale layout appshell docshell
 
 CPPSRCS		= \
 		nsBasePrincipal.cpp \