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/RectanizerBench.cpp b/bench/RectanizerBench.cpp
index 203da01..9b7e3ae 100644
--- a/bench/RectanizerBench.cpp
+++ b/bench/RectanizerBench.cpp
@@ -83,7 +83,7 @@
         }
     }
 
-    void onDraw(const int loops, SkCanvas* canvas) override {
+    void onDraw(int loops, SkCanvas* canvas) override {
         SkRandom rand;
         SkIPoint16 loc;
         SkISize size;