Simplify benchmark internal API.

bench/RegionBench.cpp

Index: bench/RegionBench.cpp
diff --git a/bench/RegionBench.cpp b/bench/RegionBench.cpp
index fb6e94f67b9e814823bec6ea919dbcde2c4da2a5..ed58e3bdebfddbfefa5dfb9ab74d8eeb47ad36c5 100644
--- a/bench/RegionBench.cpp
+++ b/bench/RegionBench.cpp
@@ -106,9 +106,9 @@ public:
 protected:
     virtual const char* onGetName() { return fName.c_str(); }
 
-    virtual void onDraw(SkCanvas* canvas) {
+    virtual void onDraw(const int loops, SkCanvas* canvas) {
         Proc proc = fProc;
-        for (int i = 0; i < this->getLoops(); ++i) {
+        for (int i = 0; i < loops; ++i) {
             proc(fA, fB);
         }
     }