Remove Sk prefix from some bench classes.

bench/PremulAndUnpremulAlphaOpsBench.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 "SkConfig8888.h"
 #include "SkString.h"
 #include "sk_tool_utils.h"
 
-class PremulAndUnpremulAlphaOpsBench : public SkBenchmark {
+class PremulAndUnpremulAlphaOpsBench : public Benchmark {
     enum {
         W = 256,
         H = 256,
     };
     SkBitmap fBmp1, fBmp2;
 
 public:
     PremulAndUnpremulAlphaOpsBench(SkColorType ct) {
         fColorType = ct;
         fName.printf("premul_and_unpremul_alpha_%s", sk_tool_utils::colortype_name(ct));
@@ skipping 26 matching lines @@
             canvas->writePixels(fBmp1.info(), fBmp1.getPixels(), fBmp1.rowBytes(), 0, 0);
             // Premul -> Unpremul
             canvas->readPixels(fBmp2.info(), fBmp2.getPixels(), fBmp2.rowBytes(), 0, 0);
         }
     }
 
 private:
     SkColorType fColorType;
     SkString fName;
 
-    typedef SkBenchmark INHERITED;
+    typedef Benchmark INHERITED;
 };
 
 
 DEF_BENCH(return new PremulAndUnpremulAlphaOpsBench(kRGBA_8888_SkColorType));
 DEF_BENCH(return new PremulAndUnpremulAlphaOpsBench(kBGRA_8888_SkColorType));