Refactoring: get rid of the SkBenchmark void* parameter.

While I was doing massive sed-ing, I also converted every bench to use DEF_BENCH instead of registering the ugly manual way.

BUG=
R=scroggo@google.com

Review URL: https://codereview.chromium.org/23876006

git-svn-id: http://skia.googlecode.com/svn/trunk@11263 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/bench/ReadPixBench.cpp b/bench/ReadPixBench.cpp
index 505ff32..f62917b 100644
--- a/bench/ReadPixBench.cpp
+++ b/bench/ReadPixBench.cpp
@@ -17,7 +17,7 @@
  */
 class ReadPixBench : public SkBenchmark {
 public:
-    ReadPixBench(void* param) : INHERITED(param) {}
+    ReadPixBench() {}
 
 protected:
     virtual const char* onGetName() SK_OVERRIDE {
@@ -64,5 +64,4 @@
 
 ////////////////////////////////////////////////////////////////////////////////
 
-static SkBenchmark* fact(void* p) { return new ReadPixBench(p); }
-static BenchRegistry gReg(fact);
+DEF_BENCH( return new ReadPixBench(); )