Remove Sk prefix from some bench classes.

bench/GMBench.h

Index: bench/GMBench.h
diff --git a/bench/SkGMBench.h b/bench/GMBench.h
similarity index 79%
rename from bench/SkGMBench.h
rename to bench/GMBench.h
index 925a87583c12683e93b41f190aa0d2d375a6aeb3..75cee6c0639261f3b0e6e549cf7af9d07dda6409 100644
--- a/bench/SkGMBench.h
+++ b/bench/GMBench.h
@@ -5,18 +5,18 @@
  * found in the LICENSE file.
  */
 
-#include "SkBenchmark.h"
-#include "gm.h"
+#include "Benchmark.h"
 #include "SkCanvas.h"
+#include "gm.h"
 
 /**
  * Runs a GM as a benchmark by repeatedly drawing the GM.
  */
-class SkGMBench : public SkBenchmark {
+class GMBench : public Benchmark {
 public:
     // Constructor takes ownership of the GM param.
-    SkGMBench(skiagm::GM* gm);
-    virtual ~SkGMBench();
+    GMBench(skiagm::GM* gm);
+    virtual ~GMBench();
 
 protected:
     virtual const char* onGetName() SK_OVERRIDE;
@@ -27,5 +27,5 @@ protected:
 private:
     skiagm::GM* fGM;
     SkString    fName;
-    typedef SkBenchmark INHERITED;
+    typedef Benchmark INHERITED;
 };