Remove unused foregroundRect argument to RenderLayerClipper::calculateRects.

sky/tests/layout/ellipsis-expected.txt

Index: sky/tests/layout/ellipsis-expected.txt
diff --git a/sky/tests/layout/ellipsis-expected.txt b/sky/tests/layout/ellipsis-expected.txt
index 49d181b8a0630b852e488ddc6d9e45e9a3f82e78..2d153be943609394d0932aae52649743ee98afe3 100644
--- a/sky/tests/layout/ellipsis-expected.txt
+++ b/sky/tests/layout/ellipsis-expected.txt
@@ -1,7 +1,7 @@
 layer at (0,0) size 800x600
   RenderView {#document} at (0,0) size 800x600
     RenderBlock {sky} at (0,0) size 800x94
-layer at (0,0) size 56x69 clip at (3,3) size 50x63
+layer at (0,0) size 56x69
   RenderBlock {div} at (0,0) size 56x69 [border: (3px solid #0000FF)]
     RenderParagraph (anonymous) at (3,3) size 50x19
       RenderText {#text} at (0,0) size 91x19
@@ -9,11 +9,11 @@ layer at (0,0) size 56x69 clip at (3,3) size 50x63
     RenderParagraph (anonymous) at (3,47) size 50x19
       RenderText {#text} at (0,0) size 94x19
         text run at (0,0) width 94: "all ellipsize."
-layer at (3,22) size 56x25 backgroundClip at (3,22) size 50x25 clip at (6,25) size 47x19
+layer at (3,22) size 56x25 backgroundClip at (3,22) size 50x25
   RenderParagraph {p} at (3,22) size 56x25 [border: (3px solid #FF0000)]
     RenderText {#text} at (3,3) size 54x19
       text run at (3,3) width 54: "should"
-layer at (0,69) size 56x25 clip at (3,72) size 50x19
+layer at (0,69) size 56x25
   RenderParagraph {p} at (0,69) size 56x25 [border: (3px solid #FF0000)]
     RenderInline {span} at (0,0) size 117x19
       RenderText {#text} at (3,3) size 117x19