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/FontScalerBench.cpp b/bench/FontScalerBench.cpp
index f813adb..a5ab7b5 100644
--- a/bench/FontScalerBench.cpp
+++ b/bench/FontScalerBench.cpp
@@ -25,7 +25,7 @@
 
 protected:
     virtual const char* onGetName() { 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.setLCDRenderText(fDoLCD);