Remove Sk prefix from some bench classes.

bench/ImageCacheBench.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 "SkScaledImageCache.h"
 
-class ImageCacheBench : public SkBenchmark {
+class ImageCacheBench : public Benchmark {
     SkScaledImageCache  fCache;
     SkBitmap            fBM;
 
     enum {
         DIM = 1,
         CACHE_COUNT = 500
     };
 public:
     ImageCacheBench()  : fCache(CACHE_COUNT * 100) {
         fBM.allocN32Pixels(DIM, DIM);
@@ skipping 20 matching lines @@
         }
 
         SkBitmap tmp;
         // search for a miss (-1 scale)
         for (int i = 0; i < loops; ++i) {
             (void)fCache.findAndLock(fBM, -1, -1, &tmp);
         }
     }
 
 private:
-    typedef SkBenchmark INHERITED;
+    typedef Benchmark INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 DEF_BENCH( return new ImageCacheBench(); )