Remove Sk prefix from some bench classes.

bench/ShaderMaskBench.cpp

Index: bench/ShaderMaskBench.cpp
diff --git a/bench/ShaderMaskBench.cpp b/bench/ShaderMaskBench.cpp
index 7323d8ee7aaeff4504f21850b9c9e4bf05ee6db4..aa3dadff2ff11fe181ac5f02be2bf23dbf452ca2 100644
--- a/bench/ShaderMaskBench.cpp
+++ b/bench/ShaderMaskBench.cpp
@@ -5,7 +5,7 @@
  * 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 "SkColorShader.h"
 #include "SkFontHost.h"
@@ -32,7 +32,7 @@ static const char* fontQualityName(const SkPaint& paint) {
     return "AA";
 }
 
-class ShaderMaskBench : public SkBenchmark {
+class ShaderMaskBench : public Benchmark {
     SkPaint     fPaint;
     SkString    fText;
     SkString    fName;
@@ -85,7 +85,7 @@ protected:
     }
 
 private:
-    typedef SkBenchmark INHERITED;
+    typedef Benchmark INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////