Remove unused (by clients) SkUnitMapper

This reverts commit 874423a81b5bc2541c7397e6ab00d5e7c9fdaf98.

TBR=scroggo

Author: reed@google.com

Review URL: https://codereview.chromium.org/288313009

git-svn-id: http://skia.googlecode.com/svn/trunk@14842 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/colortype.cpp b/gm/colortype.cpp
index 47bc8a9..2774f3a 100644
--- a/gm/colortype.cpp
+++ b/gm/colortype.cpp
@@ -20,7 +20,7 @@
         SkMatrix local;
         local.setRotate(180);
         SkShader* s = SkGradientShader::CreateSweep(0,0, colors, NULL,
-                                                    SK_ARRAY_COUNT(colors), NULL, 0, &local);
+                                                    SK_ARRAY_COUNT(colors), 0, &local);
 
         SkPaint paint;
         paint.setAntiAlias(true);