Attempt to fix bustage on Mac caused by bug 397073.

chrome/src/Makefile.in

@@ -86,5 +86,9 @@ EXTRA_DSO_LDOPTS = \
                 $(MOZ_COMPONENT_LIBS) \
                 $(NULL)
 
+ifneq (,$(filter mac cocoa,$(MOZ_WIDGET_TOOLKIT)))
+EXTRA_DSO_LDOPTS += $(TK_LIBS)
+endif
+
 include $(topsrcdir)/config/rules.mk