Remove Sk prefix from some bench classes.

bench/ImageCacheBench.cpp

Index: bench/ImageCacheBench.cpp
diff --git a/bench/ImageCacheBench.cpp b/bench/ImageCacheBench.cpp
index ef29cf88ff58571495db6619523d3a10c76880f6..5f1715fc3188cd6d7939921cd525635c9c25e335 100644
--- a/bench/ImageCacheBench.cpp
+++ b/bench/ImageCacheBench.cpp
@@ -5,10 +5,10 @@
  * 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;
 
@@ -49,7 +49,7 @@ protected:
     }
 
 private:
-    typedef SkBenchmark INHERITED;
+    typedef Benchmark INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////