Remove const from `const int loops`.

bench/MatrixConvolutionBench.cpp

Index: bench/MatrixConvolutionBench.cpp
diff --git a/bench/MatrixConvolutionBench.cpp b/bench/MatrixConvolutionBench.cpp
index 6593ab02597d7804962ba2f201d1512574b157a4..6302f1273b74eeedeaec100ce4a2bab705581d76 100644
--- a/bench/MatrixConvolutionBench.cpp
+++ b/bench/MatrixConvolutionBench.cpp
@@ -35,7 +35,7 @@ protected:
         return fName.c_str();
     }
 
-    virtual void onDraw(const int loops, SkCanvas* canvas) {
+    virtual void onDraw(int loops, SkCanvas* canvas) {
         SkPaint paint;
         this->setupPaint(&paint);
         paint.setAntiAlias(true);