Remove const from `const int loops`.

This drives me nuts, and prevents `while (loops --> 0)`.

BUG=skia:

Review URL: https://codereview.chromium.org/1379923005
diff --git a/bench/SortBench.cpp b/bench/SortBench.cpp
index f621670..9bc11c7 100644
--- a/bench/SortBench.cpp
+++ b/bench/SortBench.cpp
@@ -124,7 +124,7 @@
         gRec[fType].fProc(fUnsorted.get());
     }
 
-    void onDraw(const int loops, SkCanvas*) override {
+    void onDraw(int loops, SkCanvas*) override {
         SkAutoTMalloc<int> sorted(N);
         for (int i = 0; i < loops; i++) {
             memcpy(sorted.get(), fUnsorted.get(), N*sizeof(int));