Remove const from `const int loops`.

bench/BitmapRectBench.cpp

Index: bench/BitmapRectBench.cpp
diff --git a/bench/BitmapRectBench.cpp b/bench/BitmapRectBench.cpp
index 93659c186ce822859ac97fc9af4457b8eaa05378..7211ae256a039ffd28f7ddd58f3fead88fb5bd5d 100644
--- a/bench/BitmapRectBench.cpp
+++ b/bench/BitmapRectBench.cpp
@@ -87,7 +87,7 @@ protected:
     }
 
 
-    void onDraw(const int loops, SkCanvas* canvas) override {
+    void onDraw(int loops, SkCanvas* canvas) override {
         SkRandom rand;
 
         SkPaint paint;