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/tests/DeferredCanvasTest.cpp b/tests/DeferredCanvasTest.cpp
index a5a763a..9ffb790 100644
--- a/tests/DeferredCanvasTest.cpp
+++ b/tests/DeferredCanvasTest.cpp
@@ -359,7 +359,7 @@
         const SkColor colors[2] = {SK_ColorWHITE, SK_ColorWHITE};
         const SkScalar pos[2] = {0, SK_Scalar1};
         SkShader* shader = SkGradientShader::CreateTwoPointConical(
-            pt1, r1, pt2, r2, colors, pos, 2, SkShader::kClamp_TileMode, NULL);
+            pt1, r1, pt2, r2, colors, pos, 2, SkShader::kClamp_TileMode);
         paint.setShader(shader)->unref();
         canvas->drawRect(fullRect, paint);
         REPORTER_ASSERT(reporter, !canvas->isFreshFrame());