Remove Sk prefix from some bench classes.

bench/GMBench.h

 /*
  * Copyright 2014 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 "gm.h"
-#include "SkCanvas.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;
     virtual bool isSuitableFor(Backend backend) SK_OVERRIDE;
     virtual void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE;
     virtual SkIPoint onGetSize() SK_OVERRIDE;
 
 private:
     skiagm::GM* fGM;
     SkString    fName;
-    typedef SkBenchmark INHERITED;
+    typedef Benchmark INHERITED;
 };