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/benchmain.cpp b/bench/benchmain.cpp
index 44bc0da..3a57f2d 100644
--- a/bench/benchmain.cpp
+++ b/bench/benchmain.cpp
@@ -57,7 +57,7 @@
         if (fBench) {
             BenchRegistry::Factory f = fBench->factory();
             fBench = fBench->next();
-            return f(NULL);
+            return f();
         }
         return NULL;
     }