Get rid of excess cleverness in benchmark

bench/RotatedRectBench.cpp

Index: bench/RotatedRectBench.cpp
diff --git a/bench/RotatedRectBench.cpp b/bench/RotatedRectBench.cpp
index 87b4ec8bd4b905210aa022d229f4712de4e61d5c..90bf611eb440447094dec4e2ca634e66ec88f6dd 100644
--- a/bench/RotatedRectBench.cpp
+++ b/bench/RotatedRectBench.cpp
@@ -83,8 +83,8 @@ protected:
         paint.setXfermodeMode(fMode);
         SkColor color = start_color(fColorType);
 
-        int w = canvas->getBaseLayerSize().width();
-        int h = canvas->getBaseLayerSize().height();
+        int w = this->getSize().x();
+        int h = this->getSize().y();
 
         static const SkScalar kRectW = 25.1f;
         static const SkScalar kRectH = 25.9f;