Refactoring: get rid of the SkBenchmark void* parameter.

bench/MutexBench.cpp

Index: bench/MutexBench.cpp
diff --git a/bench/MutexBench.cpp b/bench/MutexBench.cpp
index 5a7058d5e02c578b34f809a0df6905178883f9f8..1d037ec1cd27da247e63c012c641361315918dc5 100644
--- a/bench/MutexBench.cpp
+++ b/bench/MutexBench.cpp
@@ -9,7 +9,7 @@
 
 class MutexBench : public SkBenchmark {
 public:
-    MutexBench(void* param) : INHERITED(param) {
+    MutexBench()  {
         fIsRendering = false;
     }
 protected:
@@ -31,6 +31,4 @@ private:
 
 ///////////////////////////////////////////////////////////////////////////////
 
-static SkBenchmark* Fact(void* p) { return new MutexBench(p); }
-
-static BenchRegistry gReg01(Fact);
+DEF_BENCH( return new MutexBench(); )