Remove Sk prefix from some bench classes.

bench/PerlinNoiseBench.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
-#include "SkBenchmark.h"
+#include "Benchmark.h"
 #include "SkCanvas.h"
 #include "SkPerlinNoiseShader.h"
 
-class PerlinNoiseBench : public SkBenchmark {
+class PerlinNoiseBench : public Benchmark {
     SkISize fSize;
 
 public:
     PerlinNoiseBench()  {
         fSize = SkISize::Make(80, 80);
     }
 
 protected:
     virtual const char* onGetName() SK_OVERRIDE {
         return "perlinnoise";
@@ skipping 25 matching lines @@
             SkPerlinNoiseShader::CreateTurbulence(baseFrequencyX, baseFrequencyY, numOctaves,
                                                  seed, stitchTiles ? &fSize : NULL);
         SkPaint paint;
         paint.setShader(shader)->unref();
 
         for (int i = 0; i < loops; i++) {
             this->drawClippedRect(canvas, x, y, paint);
         }
     }
 
-    typedef SkBenchmark INHERITED;
+    typedef Benchmark INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 DEF_BENCH( return new PerlinNoiseBench(); )