Remove Sk prefix from some bench classes.

bench/MemcpyBench.cpp

Index: bench/MemcpyBench.cpp
diff --git a/bench/MemcpyBench.cpp b/bench/MemcpyBench.cpp
index 3fd6dcbcfb56492f6acea9ed548d3f2bdde62006..f55019275192f83f202257a676c061eec5e9febf 100644
--- a/bench/MemcpyBench.cpp
+++ b/bench/MemcpyBench.cpp
@@ -5,13 +5,13 @@
  * found in the LICENSE file.
  */
 
-#include "SkBenchmark.h"
+#include "Benchmark.h"
 #include "SkRandom.h"
 #include "SkTemplates.h"
 #include "SkUtils.h"
 
 template <typename Memcpy32>
-class Memcpy32Bench : public SkBenchmark {
+class Memcpy32Bench : public Benchmark {
 public:
     explicit Memcpy32Bench(int count, Memcpy32 memcpy32, const char* name)
         : fCount(count)