GM : Unused parameters cleanup

I removed unused parameters in the gms wherever it was trivial to do so. I'm
trying to get the easy ones out of the way before we get into more involved
discussions around this.
Review URL: https://codereview.appspot.com/7398056

git-svn-id: http://skia.googlecode.com/svn/trunk@7881 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/rrect.cpp b/gm/rrect.cpp
index 29d0300..c13f145 100644
--- a/gm/rrect.cpp
+++ b/gm/rrect.cpp
@@ -72,7 +72,7 @@
     dst->setRectRadii(r, radii);
 }
 
-static SkScalar prop(SkScalar radius, SkScalar delta, SkScalar newSize, SkScalar oldSize) {
+static SkScalar prop(SkScalar radius, SkScalar newSize, SkScalar oldSize) {
     return newSize * radius / oldSize;
 }
 
@@ -90,8 +90,8 @@
         radii[i] = src.radii((SkRRect::Corner)i);
     }
     for (int i = 0; i < 4; ++i) {
-        radii[i].fX = prop(radii[i].fX, dx, r.width(), src.rect().width());
-        radii[i].fY = prop(radii[i].fY, dy, r.height(), src.rect().height());
+        radii[i].fX = prop(radii[i].fX, r.width(), src.rect().width());
+        radii[i].fY = prop(radii[i].fY, r.height(), src.rect().height());
     }
     dst->setRectRadii(r, radii);
 }