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/PatchBench.cpp b/bench/PatchBench.cpp
index 26caad0..6f51b45 100644
--- a/bench/PatchBench.cpp
+++ b/bench/PatchBench.cpp
@@ -123,7 +123,7 @@
         }
     }
 
-    void onDraw(const int loops, SkCanvas* canvas) override {
+    void onDraw(int loops, SkCanvas* canvas) override {
         canvas->scale(fScale.x(), fScale.y());
         for (int i = 0; i < loops; i++) {
             switch (fVertexMode) {