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/shaderbounds.cpp b/gm/shaderbounds.cpp
index f0b8b97..f82985b 100644
--- a/gm/shaderbounds.cpp
+++ b/gm/shaderbounds.cpp
@@ -19,7 +19,7 @@
     colors[1] = SK_ColorYELLOW;
   }
   return SkGradientShader::CreateLinear(pts, colors, NULL, 2,
-                                        SkShader::kClamp_TileMode, NULL, 0, &localMatrix);
+                                        SkShader::kClamp_TileMode, 0, &localMatrix);
 }
 
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