Single code path for updating invalidation sets.

LayoutTests/fast/css/invalidation/targeted-class-host-context.html

Index: LayoutTests/fast/css/invalidation/targeted-class-host-context.html
diff --git a/LayoutTests/fast/css/invalidation/targeted-class-host-context.html b/LayoutTests/fast/css/invalidation/targeted-class-host-context.html
index cce6b2bfc4ca6cac654c88d97e2fd57ba9aec5ed..df38980fdd374944bf40f43d5fca9e77c53a83e5 100644
--- a/LayoutTests/fast/css/invalidation/targeted-class-host-context.html
+++ b/LayoutTests/fast/css/invalidation/targeted-class-host-context.html
@@ -38,7 +38,7 @@ test(function(){
     assert_equals(getComputedStyle(inner, "").backgroundColor, transparent, "Background color before class change.");
     t2.className = "t2";
     if (window.internals)
-        assert_equals(internals.updateStyleAndReturnAffectedElementCount(), 8, "Element recalc count on class change.");
+        assert_equals(internals.updateStyleAndReturnAffectedElementCount(), 2, "Element recalc count on class change.");
     assert_equals(getComputedStyle(inner, "").backgroundColor, green, "Background color after class change.");
 }, "Matching id descendant of :host-context with class.");