Bench : Unused parameters cleanup

I removed unused parameters in bench wherever it was trivial to do so.
Review URL: https://codereview.appspot.com/7411046

git-svn-id: http://skia.googlecode.com/svn/trunk@7988 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/bench/BlurRectBench.cpp b/bench/BlurRectBench.cpp
index 8767dee..fec0257 100644
--- a/bench/BlurRectBench.cpp
+++ b/bench/BlurRectBench.cpp
@@ -49,7 +49,7 @@
         fName = name;
     }
 
-    virtual void onDraw(SkCanvas* canvas) {
+    virtual void onDraw(SkCanvas*) {
         SkPaint paint;
         this->setupPaint(&paint);
 
@@ -137,7 +137,7 @@
 
 protected:
 
-    virtual void makeBlurryRect(const SkRect& r) SK_OVERRIDE {
+    virtual void makeBlurryRect(const SkRect&) SK_OVERRIDE {
         SkMask mask;
         mask.fImage = NULL;
         SkBlurMask::BlurSeparable(&mask, fSrcMask, this->radius(),
@@ -163,7 +163,7 @@
 
 protected:
 
-    virtual void makeBlurryRect(const SkRect& r) SK_OVERRIDE {
+    virtual void makeBlurryRect(const SkRect&) SK_OVERRIDE {
         SkMask mask;
         mask.fImage = NULL;
         SkBlurMask::BlurGroundTruth(&mask, fSrcMask, this->radius(),