remove unused (by clients) SkUnitMapper

tests/DeferredCanvasTest.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "../src/image/SkImagePriv.h"
 #include "../src/image/SkSurface_Base.h"
 #include "SkBitmap.h"
@@ skipping 341 matching lines @@
         SkPaint paint;
         paint.setStyle(SkPaint::kFill_Style);
         // Defining a cone that partially overlaps the canvas
         const SkPoint pt1 = SkPoint::Make(SkIntToScalar(0), SkIntToScalar(0));
         const SkScalar r1 = SkIntToScalar(1);
         const SkPoint pt2 = SkPoint::Make(SkIntToScalar(10), SkIntToScalar(0));
         const SkScalar r2 = SkIntToScalar(5);
         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());
     }
     {
         SkPaint paint;
         paint.setStyle(SkPaint::kFill_Style);
         SkBitmap bmp;
         create(&bmp, 0xFFFFFFFF);
         bmp.setAlphaType(kPremul_SkAlphaType);
@@ skipping 458 matching lines @@
     TestDeferredCanvasSurface(reporter, NULL);
     TestDeferredCanvasSetSurface(reporter, NULL);
 }
 
 DEF_GPUTEST(DeferredCanvas_GPU, reporter, factory) {
     if (factory != NULL) {
         TestDeferredCanvasSurface(reporter, factory);
         TestDeferredCanvasSetSurface(reporter, factory);
     }
 }