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/WriterBench.cpp b/bench/WriterBench.cpp
index 948c0ad..0956b22 100644
--- a/bench/WriterBench.cpp
+++ b/bench/WriterBench.cpp
@@ -12,9 +12,7 @@
 
 class WriterBench : public SkBenchmark {
 public:
-    WriterBench(void* param) : INHERITED(param) {
-        fIsRendering = false;
-    }
+    WriterBench() { fIsRendering = false; }
 
 protected:
     virtual const char* onGetName() SK_OVERRIDE {
@@ -38,5 +36,4 @@
 
 ////////////////////////////////////////////////////////////////////////////////
 
-static SkBenchmark* fact(void* p) { return new WriterBench(p); }
-static BenchRegistry gReg(fact);
+DEF_BENCH( return new WriterBench(); )